HC-05 Comandos AT

HC-03/05 Embedded Bluetooth Serial Communication Module
AT command set

                                                                                                 Last revised: April, 2011

HC-05 embedded Bluetooth serial communication module (can be short for
module) has two work modes: order-response work mode and automatic connection
work mode. And there are three work roles (Master, Slave and Loopback) at the
automatic connection work mode. When the module is at the automatic connection
work mode, it will follow the default way set lastly to transmit the data automatically.
When the module is at the order-response work mode, user can send the AT command to
the module to set the control parameters and sent control order. The work mode of
module can be switched by controlling the module PIN (PIO11) input level.

Serial module PINs:
1. PIO8 connects with LED. When the module is power on, LED will flicker. And the
flicker style will indicate which work mode is in using since different mode has
different flicker time interval.
2. PIO9 connects with LED. It indicates whether the connection is built or not. When
the Bluetooth serial is paired, the LED will be turned on. It means the connection is
built successfully.
3. PIO11 is the work mode switch. When this PIN port is input high level, the work
mode will become order-response work mode. While this PIN port is input low level or
suspended in air, the work mode will become automatic connection work mode.
4. The module can be reset if it is re-powered since there is a reset circuit at the module.
===========================Notification ==========================

1. How to get to the AT mode.

Way 1:
Step 1: Input low level to PIN34. Step 2: Supply power to the module. Step 3: Input
high level to the PIN34. Then the module will enter to AT mode. The baud rate is as
same as the communication time, such as 9600 etc.
Way 2: Step 1: Connect PIN34 to the power supply PIN. Step 2: Supply power to
module (the PIN34 is also supplied with high level since the PIN34 is connected with
power supply PIN). Then the module will enter to AT module. But at this time, the baud
rate is 38400. In this way, user should change the baud rate at the AT mode, if they
forget the communication baud rate.

How to get to the communication mode: Step 1: Input low level to PIN34. Step 2:
Supply power to the module. Then the module will enter to communication mode. It can
be used for pairing.

2. How to set this module be the master role.

Step 1: Input high level to PIO11.
Step 2: Supply power to the module. And the module will enter to the order-response
work mode.
Step 3: Set the parameters of the super terminal or the other serial tools (baud rate:
38400, data bit:8, stop bit:1, no parity bit, no Flow Control)
Step 4: Sent the characters “AT+ROLE=1\r\n” through serial, then receive the
characters “OK\r\n”. Here, “\r\n” is the CRLF.
Step 5: Input low level to PIO, and supply power to the module again. Then this module
will become master role and search the other module (slave role) automatically to build
the connection.

3. Notes.

(1) HC-03 and HC-05’s command should end up with “\r\n”. It means when you finish
programming, you should add terminator (“ENTER” or “0x0d 0x0a”) to the program.
It’s different from HC-04 and HC-06 (They don’t need terminator).
(2) The most common commands for HC-03 and HC-05 are: AT+ROLE (set master
–slave), AT+CMODE( set address pairing) , AT+PSWD (set password).
If you want the master module has the function of remembering slave module, the most
simply way is: First, set AT+CMODE=1. Make the master module pair with the slave
module. Second, set AT+CMODE=0. Then the master module just can make pair with
that specified slave module.
(3) When PIN34 keeps high level, all commands can be used. Otherwise, only some of
them can be used.
==============================================================

Detailed description of Command

(AT command is case- sensitive, should end up with terminator (“enter” or “\r\n”).)

1. Test.

Command                    Response                     Parameter
      AT                              OK                               None

2. Reset

Command                    Response                     Parameter
AT+RESET                     OK                               None

3. Get the soft version.

Command                     Response                     Parameter
AT+VERSION?     +VERSION: <Param>     Param: Version number
                                          OK

Example :

at+version?\r\n
+VERSION:2.0-20100601
OK

4. Restore default status

Command                  Response                     Parameter
AT+ORGL                    OK                               None
The parameter of default status:
①.Device type: 0
②.Inquire code: 0x009e8b33
③.Module work mode: Slave Mode
④.Connection mode: Connect to the Bluetooth device specified
⑤.Serial parameter: Baud rate: 38400 bits/s; Stop bit: 1 bit; Parity bit: None.
⑥.Passkey: “1234”
⑦.Device name: “H-C-2010-06-01”
………..

5. Get module Bluetooth address.

Command                     Response                     Parameter
AT+ADDR?           +ADDR: <Param>     Param: Bluetooth address
                                           OK

Bluetooth address will show as this way: NAP: UAP: LAP(Hexadecimal)

Example:

Module Bluetooth address: 12: 34: 56: ab: cd: ef
at+addr?\r\n
+ADDR:1234:56:abcdef
OK

6. Set/ inquire device’s name.

Command                     Response                     Parameter
AT+NAME=<Param>     OK

AT+NAME?           1. +NAME:<Param>      Param: Bluetooth device name
                                     OK----success                 Default: “HC-05”
                                2. FAIL----failure

                             
Example:

AT+NAME=HC-05\r\n ---set the module device name: “HC-05”
OK
AT+NAME= “HC-05”\r\n ---set the module device name: “HC-05”
OK
at+name=Beijin\r\n ---set the module device name: “Beijin”
OK
at+name= “Beijin”\r\n ---set module device name : “Beijin”
OK
at+name?\r\n
+NAME: Bei jin
OK

7. Get the remote Bluetooth device’s name.

Command                                        Response                               Parameter
AT+RNAME?<Param1>      1. +NAME:<Param2>         Param1: Remote Bluetooth
                                                    OK----success                device address
                                               2. FAIL----failure               Param2: Remote Bluetooth
                                                                                           device address

Bluetooth address will show as this way: NAP:UAP:LAP (Hexadecimal)

Example:

Bluetooth device address: 00:02:72: od: 22 : 24; device name: Bluetooth
at+rname? 0002,72,od2224\r\n
+RNAME:Bluetooth
OK

8. Set/ inquire module role.

Command                              Response                     Parameter
AT+ROLE=<Param>               OK                             Param:

AT+ ROLE?                    + ROLE:<Param>        0---- Slave role
                                                OK                        1---- Master role
                                                                              2---- Slave-Loop role
                                                                                    Default: 0

Role introduction:
Slave (slave role)----Passive connection;
Slave-Loop----Passive connection, receive the remote Bluetooth master device data and
send it back to the master device;
Master (master role)----Inquire the near SPP Bluetooth slave device, build connection
with it positively, and build up the transparent data transmission between master and
slave device.

9. Set/inquire device type

Command                                    Response                        Parameter
AT+CLASS=<Param>                   OK                        Param: device type
                                                                                      Bluetooth device type is a 32-bit
AT+ CLASS?                    1. + CLASS:<Param>       parameter indicates the device
                                                OK----success              type and what type can be
                                           2. FAIL----failure             supported.
                                                                                     Default: 0
                                                                                     More information is provided at
                                                                                     the appendix 1(device type
                                                                                     introduction).

For inquiring the custom Bluetooth device from around Bluetooth devices quickly
and effectively, user can set the module to be non-standard Bluetooth device type, such
as 0x1f1f (Hexadecimal).

10. Set/ inquire-Inquire access code.

Command                         Response                         Parameter
AT+IAC=<Param>       1. OK----success             Param: Inquire access code
                                       2. FAIL----failure           Default: 9e8b33
                                                                              The more information is provided at the
AT+ IAC?                    +IAC: <Param>               appendix 2(Inquire access code introduction)
                                               OK

Access code is set to be GIAC type (General Inquire Access Code:0x9e8b33), and
used for seeking ( or being sought by ) all the Bluetooth devices around.
For inquiring (or being inquiring by) the custom Bluetooth device from around
Bluetooth devices quickly and effectively, user can set the inquire access code to be the
other type number (not GIAC nor LIAC), such as 9e8b3f.

Example:

AT+IAC=9e8b3f\r\n
OK
AT+IAC?\r\n
+IAC: 9e8b3f
OK

11. Set/ inquire - Inquire access mode.

Command                               Response                     Parameter
AT+INQM=<Param>,      1. OK----success            Param: Inquire access mode
<Param2>,<Param3>        2. FAIL----failure          0----inquiry_mode_standard
                                                                                 1----inquiry_mode_rssi
                                                                                 Param2: the maximum of Bluetooth
AT+ INQM?                      +INQM:<Param>,        devices response
                                        <Param2>,<Param3>      Param3:The maximum of limited
                                                      OK                     inquiring time
                                                                                 The range of limited time: 1~48
                                                                                ( Corresponding time:1.28s~61.44s)
                                                                                 Default: 1, 1, 48

Example:

AT+INQM=1,9,48\r\n ----Set Inquire access mode: 1) has RSSI signal intensity
indicator, 2) stop inquiring once more than 9 devices
response, 3) limited time is 48*l. 28=61.44s.
OK
AT+INQM\r\n
+INQM:1, 9, 48
OK

12. Set/Inquire- passkey

Command                              Response                           Parameter
AT+PSWD=<Param>                  OK                            Param: passkey

AT+ PSWD?                      + PSWD : <Param>            Default: “1234”
                                                    OK

13.Set/ Inquire- serial parameter

Command                          Response                        Parameter
AT+UART=<Param>,            OK                       Param1: baud rate( bits/s)
<Param2>,<Param3>                                          The value (Decimal) should
                                                                             be one of the following:
                                                                             4800
AT+ UART?                +UART=<Param>,        9600
                                    <Param2>,<Param3>      19200
                                                OK                       38400
                                                                            57600
                                                                            115200
                                                                            23400
                                                                            460800
                                                                            921600
                                                                            1382400
                                                                            Param2:stop bit:
                                                                            0----1 bit
                                                                            1----2 bits
                                                                            Param3: parity bit
                                                                            0----None
                                                                            1----Odd parity
                                                                            2----Even parity
                                                                            Default: 9600, 0, 0
                                         

Example:

Set baud rate to be 115200, stop bit to be 2 bits, parity bit to be even parity.
AT+UART=115200,1,2,\r\n
OK
AT+UART?
+UART:115200,1,2
OK

14. Set/ Inquire - connection mode

Command                                Response                              Parameter
AT+CMODE=<Param>                 OK                              Param:
                                                                                            0----connect the module to the
AT+ CMODE?                    + CMODE:<Param>              specified Bluetooth address.
                                                         OK                             ( Bluetooth address can be
                                                                                            specified by the binding
                                                                                            command)
                                                                                            1----connect the module to any
                                                                                            address
                                                                                            (The specifying address has no
                                                                                            effect for this mode.)
                                                                                            2----Slave-Loop
                                                                                            Default connection mode: 0

 15. Set/Inquire - bind Bluetooth address.

  Bluetooth address will show as this way:     NAP: UAP:LAP(Hexadecimal)                                                                                
    Command                               Response                              Parameter
AT+BIND=<Param>                        OK                            Param----Bluetooth address
                                                                                            needed to be bind
AT+ BIND?                           + BIND:<Param>                Default address:
                                                           OK                           00:00:00:00:00:00

Bluetooth address will show as this way: NAP:UAP:LAP(Hexadecimal)
   This command is effective only when the module wants to connect to the specified
Bluetooth address.
Example:
    The module is at connection mode which connects to specified Bluetooth address,
and the specified address is 12:34:56:ab:cd:ef.
    Command and the response show as follow:

 AT+BIND=1234, 56, abcdef\r\n
 OK
 AT+BIND?\r\n
 +BIND:1234:56:abcdef
 OK

16. Set/Inquire - drive indication of LED and connection status.

Command                               Response                             Parameter
AT+POLAR=<Param1>,             OK                                 Param1:The value is
        <Param1>                                                                    0----PI08 outputs low level and turn on
                                                                                             LED
AT+ BIND?                       + POLAR=<Param1>,             1----PI08 outputs high level and turn on
                                                  <Param1>                          LED
                                                      OK                                 Param2:The value is
                                                                                             0----PI09 output low level, indicate
                                                                                             successful connection
                                                                                            1----PI09 output high level, and
                                                                                             indicate successful connection
                                                                                             Default: 1, 1
   HC-05 Bluetooth module definition: The output of PI08 drives indication of LED
work mode; the output of PI09 indicates the connection status.
Example:
   PI08 outputs low level and turn on LED, PI09 outputs high level and indicates
successful connection.
   Command and response show as follow:
  AT+POLAR=0, 1\r\n
  OK
  AT+POLAR?\r\n
  +POLAR=0, 1
  OK

17. Set PIO single port output.

 Command                                    Response                                 Parameter
AT+PIO=<Param1>,<Param2>         OK                            Param1: PIO port number(Decimal)
                                                                                             Param2: PIO port status
                                                                                             0----low level
                                                                                             1----high level
    HC-05 Bluetooth module provides the user with the ports (PI00~PI07 and PI010)
which can extern another input and output ports.
Example:
  1. PI010 port outputs high level
  AT+PI0=10, 1\r\n
  OK
  2. PI010 port outpust low level
  AT+PI0=10, 0\r\n
  OK

18. Set PIO multiple port output.

Command                              Response                             Parameter
AT+MPIO=<Param>                  OK                             Param: Mask combination of
                                                                                       PIO ports number (Decimal)

   HC-05 Bluetooth module provides the ports (PI00~PI07 and PI010) which can
extern another input and output ports to the user.
  (1) Mask of PIO port number = (1<<port number)
  (2) Mask combination of PIO ports number= (PIO port number mask 1|PIO port number
  mask 2|……)
Example :
  PI02 port number mask=(1<<2) =0x004
  PI010 port number mask =(1<<10)=0x400
  Mask combination of PI02 and PI010 port number=(0x004|0x400)=0x404
Example:
  1. PI010 and PI02 ports output high level
  AT+MPI0=404\r\n
  OK
  2. PI04 port output high level
  AT+PI0=004\r\n
  OK
  3. PI010 port output high level
  AT+PI0=400\r\n
  OK
  4. All ports output low level
  AT+MPI0=0\r\n
  OK

19. Inquire PIO port input.

Command                      Response                     Parameter
AT+MPIO?               +MPIO: <Param>           Param----PIO port value (16bits)
                                          OK                           Param[0]=PI00
                                                                           Param[1]=PI01
                                                                           Param[2]=PI02
                                                                           ……
                                                                           Param[10]=PI010
                                                                           Param[11]=PI011

     HC-05 Bluetooth module provides the user with the ports (PI00~PI07 and PI010)
which can extern another input and output ports.

20. Set/ Inquire page scan and inquire scan parameter.

Command                                   Response                                  Parameter
AT+IPSCAN=<Param1>,                OK                                   Param1:time interval of
<Param2>,                                   +IPSCAN:                            inquiring
<Param3>,<Param4>AT+I      <Param1>,<Param2>,              Param2: duration in inquiring
PSCAN?                                   <Param3>,<Param4>               Param3: time interval of paging
                                                          OK                                   Param4: duration in paging
                                                                                                   The above parameters are
                                                                                                   decimal.
                                                                                                    Default:1024,512,1024,512
Example:
  at+ipscan=1234,500,1200,250\r\n
  OK
  at+ipscan?
  +IPSCAN:1234,500,1200,250

21. Set/ Inquire—SHIFF energy parameter.

Command                              Response                             Parameter
AT+SNIFF=<Param1>                OK                               Param1: maximum time
     , <Param2>,                                                                  Param2: minimum time
<Param3>,<Param4>                                                        Param3: test time
                                                                                           Param4: limited time
AT+IPSCAN?                           +SNIFF:                          The above parameters are decimal.
                                          <Param1>,<Param2>,              Default : 0,0,0,0
                                          <Param3>,<Param4>

22. Set/ Inquire safe and encryption mode.

Command                               Response                               Parameter
AT+SENM=<Param           1. OK----success                     Param: the value of safe mode:
>,<Param2>,                        2. FAIL----failure                   0----sec_mode0+off
                                                                                             1----sec_mode1+non_secure
                                                                                             2----sec_mode2_service
AT+ SENM?                       +SENM:<Param>,                  3----sec_mode3_link
                                             <Param2>,                              4----sec_mode_unknown
                                                        OK                               Param2: the value of encryption mode:
                                                                                             0----hci_enc_mode_off
                                                                                             1----hci_enc_mode_pt_to_pt
                                                                                             2----hci_enc_mode_pt_to_pt_and_bcast
                                                                                             Default: 0,0

23. Delete authenticated device in the Bluetooth pair list.

Command                                 Response                               Parameter
AT+PMSAD=<Param>                  OK                              Param: Bluetooth device address

Example:
  Delete the device ( address: 12:34:56:ab:cd:ef ) in the blue pair list
  at+rmsad=1234,56,abcdef\r\n
  OK ---- successful deletion
  Or
  at+rmsad=1234,56,abcdef\r\n
  FAIL ----There is no the Bluetooth device whose address is 12:34:56:ab:cd:ef
  in the pair list.

24. Delete all authenticated devices in the pair list.

Command                                  Response                              Parameter
AT+RMAAD                                   OK                                        None

Example:
  Move all devices away from the pair list.
  at+rmaad\r\n
  OK

25. Seek the authenticated device in the Bluetooth pair list

Command                                 Response                                Parameter
AT+FSAD=<Param>            1. OK----success                    Param: Bluetooth device address
                                               2. FAIL----failure

Example:
  Seek the authenticated device (address: 12:34:56:ab:cd:ef) in the pair list
  at+fsad=1234,56,abcdef\r\n
  OK ----the Bluetooth device whose address is 12:34:56:ab:cd:ef is found.
  at+fsad=1234,56,abcde0\r\n
  FAIL ----There is no the Bluetooth device whose address is 12:34:56:ab:cd:e0 in
  the pair list.

26. Get the authenticated device count from the pair list.

Command                                  Response                               Parameter
AT+ADCN?                        +ADCN:<Param>                 Param: Authenticated Device
                                                        OK                             Count

Example:
  at+adcn?
  +ADCN:0 ----There is no authenticated device in the pair list.
  OK

27. Get the Bluetooth address of Most Recently Used Authenticated Device

Command                              Response                          Parameter
AT+MRAD?                   + MRAD : <Param>               Param: the Bluetooth address of
                                                    OK                               Most Recently Used
                                                                                        Authenticated Device
Example:
  at+mrad?
  +MRAD:0:0:0 ----There is no device that has been used recently.
  OK

28. Get the work status of Bluetooth module.

Command                               Response                           Parameter
AT+STATE?                  + STATE: <Param>                 Param: work status of module
                                                     OK                               Return value:
                                                                                          “INITIALIZED” ----initialized status
                                                                                          “READY” ---- ready status
                                                                                          “PAIRABLE” ----pairable status
                                                                                          “PAIRED” ----paired status
                                                                                          “INQUIRING” ----inquiring status
                                                                                          “CONNECTING”----connecting status
                                                                                           “CONNECTED”----connected status
                                                                                           “DISCONNECTED”----disconnected status
                                                                                           “NUKNOW”----unknown status
Example:
  at+state?
  +STATE:INITIALIZED ----initialized status
  OK

29. Initialize the SPP profile lib.

Command                           Response                          Parameter
AT+INIT                        1. OK----success                          None
                                        2. FAIL----failure

30. Inquire Bluetooth device.

Command                             Response                           Parameter
AT+INQ                    +INQ: <Param1>,<Param2>,      Param1: Bluetooth address
                                   <Param3>,……                           Param2: device type
                                                    OK                              Param3: RSSI signal
                                                                                        intensity
Example 1:
  at+init\r\n ---- Initialize the SPP profile lib( can’t repeat initialization)
  OK
  at+iac=9e8b33\r\n ----Inquire Bluetooth device has an access code
  OK
  at+class=0\r\n ----Inquire the Bluetooth device type
  at+inqm=1,9,48\r\n ----Inquire mode: 1) has the RSSI signal intensity indication, 2)
  stop inquiring if more than 9 Bluetooth devices response, 3)
  limited time in inquiring is 48*1.28=61.44s.
  At+inq\r\n ----inquire the Bluetooth device around
  +INQ:2:72:D2224,3E0104,FFBC
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC0
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:2:72:D2224,3F0104,FFAD
  +INQ:1234:56:0,1F1F,FFBE
  +INQ:1234:56:0,1F1F,FFC2
  +INQ:1234:56:0,1F1F,FFBE
  +INQ:2:72:D2224,3F0104,FFBC
  OK
Example 2:
  at+iac=9e8b33\r\n ----inquire the Bluetooth device has an access code
  OK
  at+class=1f1f\r\n ----inquire the Bluetooth device whose device type is 0x1f1f
  OK
  at+inqm=1,9,48\r\n ----inquire mode: 1) has the RSSI signal intensity indication, 2) stop
  inquiring if more than 9 Bluetooth devices response, 3) limited time in inquiring is
  48*1.28=61.44s
  At+inq\r\n ----filter and inquire the Bluetooth device around
  +INQ:1234:56:0,1F1F,FFC2
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC2
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC1
  +INQ:1234:56:0,1F1F,FFC0
  +INQ:1234:56:0,1F1F,FFC2
  OK
Example 3:
  at+iac=9e8b3f\r\n ---- inquire the Bluetooth device whose access code is 0x9e8b3f
  OK
  at+class=1f1f\r\n ----inquire the Bluetooth device whose device type is 0x1f1f
  OK
  at+inqm=1,1,20\r\n ----inquire mode: 1) Has the RSSI signal intensity indication,
  2) stop inquiring if more than 1 Bluetooth device response,
  3) limited time in inquiring is 20*1.28=25.6s
  At+inq\r\n ----filter and inquire the Bluetooth device around
  +INQ:1234:56:ABCDEF,1F1F,FFC2
  OK

31. Cancel Bluetooth device.

  Command                            Response                             Parameter
AT+INQC                                  OK                                          None

32. Set pair.

  Command                            Response                             Parameter
AT+PAIR=                         1. OK----success                Param1: Bluetooth address of
<Param1>,<Param2>          2. FAIL----failure              remote device
                                                                                       Param2: limited time of
                                                                                       connection (second)
Example:
  Make pair with the remote Bluetooth device( address:12:34:56:ab:cd:ef), the
  limited time is 20s.
  At+pai=1234,56,abcdef,20\r\n
  OK

33. Connect device.

  Command                          Response                          Parameter
AT+LINK=<Param>      1. OK----success               Param: Bluetooth address of
                                        2. FAIL----failure              remote device
Example:
    Connect with the remote Bluetooth device (address: 12:34:56:ab:cd:ef)
  at+fsad=1234,56,abcdef\r\n ----To check whether the Bluetooth device (address:
                                                      12:34:56:ab:cd:ef) is in the pair list or not.
  OK
  at+link=1234,56,abcdef\r\n ----The Bluetooth device (address: 12:34:56:ab:cd:ef)
  is in the pair list. The connection can be built
  directly without inquiring.
  OK

34. Disconnection.

Command                          Response                              Parameter
AT+DISC                1.+DISC:SUCCESS---                           None
                                 successful Disconnection
                                OK
                                2.+DISC:LINK_LOSS----
                                lose the connection
                                OK
                                3.+DISC:NO_SLC----
                                No SLC connection
                                OK
                                4、+DISC:TIMEOUT----
                                disconnection timeout
                                OK
                                5、+DISC:ERROR----
                                disconnection error
                                OK

35. Enter to energy mode:

  Command                           Response                                 Parameter
AT+ENSNIFF=<Param>           OK                               Param: Bluetooth address of device

36. Exit energy mode.

  Command                           Response                                 Parameter
AT+EXSNIFF=<Param>           OK                               Param: Bluetooth address of device

Appendix 1:Introduction of AT command error code

The form of error ---- ERROR:(error_code)
error_code(Hexadecimal)               Note
  0                                               AT command error
  1                                               Default result
  2                                               PSKEY write error
  3                                              Too long length of device name (more than 32 bytes).
  4                                              No device name
  5                                              Bluetooth address: NAP is too long.
  6                                              Bluetooth address: UAP is too long.
  7                                              Bluetooth address: LAP is too long.
  8                                              No PIO number’s mask
  9                                              No PIO number
  A                                             No Bluetooth devices.
  B                                             Too length of devices
  C                                             No inquire access code
  D                                             Too long length of inquire access code
  E                                              Invalid inquire access code
  F                                              The length of passkey is 0.
  10                                            Too long length of passkey (more than 16 bytes)
  11                                             Invalid module role
  12                                             Invalid baud rate
  13                                             Invalid stop bit
  14                                             Invalid parity bit
  15                                             Authentication device is not at the pair list.
  16                                             SPP lib hasn’t been initialized.
  17                                             SPP lib has been repeated initialization.
  18                                             Invalid inquire mode
  19                                             Too long inquire time
  1A                                            No Bluetooth address
  1B                                            Invalid safe mode
  1C                                            Invalid encryption mode

Appendix 2: The introduction of devices

    The Class of Device/Service(CoD) is a 32 bits number that of 3 field specifies the
service supported by the device. Another field specifies the minor device class, which
describes the device type in more detail
    The Class of Device /Service (CoD) field has a variable format. The format is
indicated using the ’within the CoD .The length of the Format Type field is variable and
ends with two bits different from’11’.The version field starts at the least significant bit
of the CoD and may extend upwards. In the ’format#1’ of the CoD (format Type field
=00), 11 bits are assigned as a bit –mask (multiple bits can be set) each bit
corresponding to a high level generic category of service class. Currently 7 categories
are defined. These are primarily of a’ public service’ nature. The remaining 11 bits are
used for indicating device type category and other device-specific characteristics. Any
reserved but otherwise unassigned bits, such as in the Major Service Class field, should
be to 0.

  Figure 1.2: The Class of Device/Service field (format type). Please note the krder in
which the octets are sent on the air and stored in memory. Bit number 0 is sent first on
the air .

  1. MAJOR SERVICE CLASSES
  Bit no Major Service Class
  13 Limited Discoverable Mode [Ref #1]
  14 (reserved)
  15 (reserved)
  16 Positioning(Location identification)
  17 Networking (LAN, Ad hoc, … )
  18 Rendering (Printing ,Speaker,…)
  19 Capturing (Scanner, Microphone,…)
  20 0bject Transfer (v-Inbox, v-Folder,…)
  21 Audio (Speaker, Microphone, Headset service,…)
  22 Telephony (Cordless telephony, Modem, Headset service,…)
  23 Information (WEB-server, WAP- server,…)
  TABLE 1.2:MAJOR SERVICE CLASSES
  [Ref #1 As defined in See Generic Access Profile, Bluetooth SIG]

  2. MAJOR DEVICE CLASSES
    The Major Class segment is the highest level of granularity for defining a
  Bluetooth Device. The main function of a device is used for determining the major
  Class grouping. There are 32 different possible major classes. The assignment of this
  Major Class field is defined in Table1.3.
  1 2 1 1 1 0 9 8 Major Device Class
  0 0 0 0 0 Miscel laneous [Ref #2]
  0 0 0 0 1 Computer (desktop, notebook, PDA, organizers,…)
  0 0 0 1 0 Phone (cellular ,cordless ,payphone, modem,…)
  0 0 0 1 1 LAN/Network Access point
  0 0 1 0 0 Audio/Video (headset, speaker, stereo, video display, vcr …)
  0 0 1 0 1 Periphereal (mouse, joystick, keyboards.…)
  0 0 1 1 0 Imaging (printing, scanner, camera, display,…)
  1 1 1 1 1 Uncategorized, specific device code not specified
  X X X X All other values reserved
  TABLE 1.3: MAJOE DEVICE CLASSES
  [Ref #2:Used where a more specific Major Device Class is not suited (but only as
  specified as in this document) .Devices that do not have a major class assigned can use
  the all-1 code until’ classified’]

  3. THE MINOR DEVICE CLASS FIELD
      The’ Minor Device Class field’ (bits 7 to 2 in the CoD ), are to be interpreted only
  in the context of the Major Device Class (but interpreted of the Service Class field).
  Thus the meaning of the bits may change, depending on the value of the ’ Major Device
  Class field’. When the Minor Device Class field indicates a device class ,then the
  primary decvice class should be reported, e. g . a cellular phone that can work as a
  cordless handset should

  4. MINOR DEVICE CLASS FIELD–COMPUTER MAJOR CLASS
  Minor Device Class
  7 6 5 4 3 2 bit no of CoD
  0 0 0 0 0 0 Uncategorized, code for device not assigned
  0 0 0 0 0 1 Desktop workstation
  0 0 0 0 1 0 Server-class computer
  0 0 0 0 1 1 Laptop
  0 0 0 1 0 0 Handheld PC/PDA(clam shell)
  0 0 0 1 0 1 Palm sized PC/PDA
  0 0 0 1 1 0 Wearable computer (Watch sized)
  X X X X X X All other values reserved
  TABLE 1.4: SUB DEVICE CLASS FIELD FOR THE’ COMPUTER ’MAJOR CLASS

  5. MINOR DEVICE CLASS FIELD – PHONE MAJOR CLASS
  Minor Device Class
  7 6 5 4 3 2 bit no of CoD
  0 0 0 0 0 0 Uncategorized, code for device not assigned
  000001 Cellular
  0 0 0 0 1 0 Cordless
  0 0 0 0 1 1 Smart phone
  0 0 0 1 0 0 Wired modem or voice gateway
  0 0 0 1 0 1 Common ISDN Access
  0 0 0 1 1 0 Sim Card Reader
  X X X X X X All other values reserved
  TABLE1.5: SUB DEVICE CLASSES FOR THE’PHONE’ MAJOR CLASS

  6. MINOR DEVICE CLASS FIELD –LAN/NETWORK ACCESS POINE MAJOR
  CLASS
  Minor Device Class
  7 6 5 bit no of CoD
  0 0 0 Fully available
  0 0 1 1 – 17% utilized
  0 1 0 1 7 - 33% utilized
  0 1 1 3 3 – 50% utilized
  1 0 0 5 0 – 67% utilized
  1 0 1 6 7 – 83% utilized
  1 1 0 8 3 – 99% utilized
  1 1 1 No service available [REF #3]
  XXX All other values reserved
  TABLE1.6: THE LAN/NETWORK ACCESS POINE LOAD FACTOR FIELD
  [Ref #3:“Device is fully utilized and cannot accept additional connections at this time,
  please retry later”]
  The exact loading formula is not standardized. It is up to each LAN/Network
  Access Point implementation to determine what internal conditions to report as a
  utilization of communication requirement is that the box .As a recommendation, a client
  that locates multiple LAN/Network Access Points should attempt to connect to the one
  reporting the lowest load.
  Minor Device Class
  4 3 2 bit no of CoD
  0 0 0 Uncategorized (use this value if no other apply )
  XXX All other values reserved
  TABLE1.7:RESERVED SUB-FIELD FOR THE LAN/NETWORK ACCESS POINE

  7. MINOR DEVICE CLASS FIELD – AUDIO/VIDEO MAJOR CLASS
  Minor Device Class
  7 6 5 4 3 2 bit no of CoD
  0 0 0 0 0 0 Uncategorized, code not assigned
  0 0 0 0 0 1 Device conforms to the Headset profile
  000010 Hands-free
  0 0 0 0 1 1 (Reserved )
  0 0 0 1 0 0 Microphone
  0 0 0 1 0 1 Loudspeaker
  0 0 0 1 1 0 Headphones
  0 0 0 1 1 1 Portable Audio
  0 0 1 0 0 0 Car audio
  0 0 1 0 0 1 Set-top box
  0 0 1 0 1 0 HiFi Audio Device
  001011 VCR
  0 0 1 1 0 1 Camcorder
  0 0 1 1 1 0 Video Monitor
  0 0 1 1 1 1 Video Display and Loudspeaker
  0 1 0 0 0 0 Video Conferencing
  0 1 0 0 0 1 (Reserved)
  0 1 0 0 1 0 Gaming/Toy [Ref #4]
  X X X X X X All other values reserved
  [Ret #4: Only to be used with a Gaming/Toy device that makes audio/video capabilities
  available via Bluetooth]
  TABLE 1.8: SUB DEVICES FOR THE ’AUDIO/VIOEO’MAJOR CLASS

  8. MINOR DEVICE CLASS FIELD – PERIPHERAL MAJOR CLASS
  Minor Device Class
  7 6 bit no of CoD
  0 1 Keyboard
  1 0 Pointing device
  1 1 Combo keyboard /pointing device
  X X X All other values reserved
  TABLE1.9: THE PERIPHERAL MAJOR CLASS KEYBOARD/POINTING DEVICE
  FIELD
  Bits 6 and 7 independently specify mouse, keyboard or combo mouse/keyboard devices.
  These may be combined with the lower bits in a multifunctional device.
  Minor Device Class
  5 4 3 2 bit no of CoD
  0 0 0 0 Uncategorized device
  0 0 0 1 Gamepd
  0 0 1 1 Remote control
  0 1 0 0 Sensing device
  0 1 0 1 Digitizer tablet
  X X X X All other values reserved
  TABLE1.10: RESERVED SUB-FIELD FOR THE DEVICE TYPE

  9. MINOR DEVICE CLASS FIELD – IMAGING MAJOR CLASS
  Minor Device Class
  7 6 5 4 bit no of CoD
  X X X 1 Display
  X X 1 X Camera
  X 1 X X Scanner
  1 X X X Printer
  X X X X All other values reserved
  TABLE 1.11: THE TMAGING MAJOR CLASS BITS 7 TO 7
  Bits 4 to 7 independently specify bi splay, camera, scanner or printer. These may be
  combined in a multifunctional device.
  Minor Device Class
  3 2 bit no of CoD
  0 0 Uncategorized, default
  X X All other values reserved
  TABLE 1. 12: THE IMAGING MAJOR CLASS BITS 2 AND 3
  Bits 2 and 3 are reserved

Appendix 3: (The Inquiry Access Codes)

  The General-and Device-Specific Inquiry Access Codes (DIACs)
  The Inquiry Access Code is the first level of filtering when finding Bluetooth devices.
  The main purpose of defining multiple IACs is to limit the number of responses that are
  received when scanning devices within range.
  0. 0x9E8B33 ---- General/Unlimited Inquiry Access Code(GIAC)
  1. 0x9E8B00 ---- Limited Dedicated Inquiry Access Code(LIAC)
  2. 0x9E8B01 ~ 0x9E8B32 RESERVED FOR FUTURE USE
  3. 0x9E8B34 ~ 0x9E8B3F RESERVED FOR FUTURE USE
  The Limited Inquiry Access Code(LIAC)is only intended to be used for limited
  time periods in scenarios where both sides have been explicitly caused to enter this state,
  usually by user action. For further explanation of the use of the LIAC, please refer to the
  Generic Access Profile.
  In contrast it is allowed to be continuously scanning for the General Inquiry Access
  Code (GIAC)and respond whenever inquired.

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