FSC-BT936D programming user guide

Introduction

Description

This design guide is suitable for engineers to develop FSC-BT936D series Bluetooth modules

Module Default Settings

Name	FSC-BT936D-XXXX
LE-Name	FSC-BT936D-LE-XXXX
Pin Code	0000
Secure Simple Pairing Mode	On
UART Baudrate	115200/8/N/1

Hardware Description

Pin Diagram

Pin Description

Pin	Pin Name	Type	Pin Descriptions
4	MIC_N	Audio	MIC input, negative
5	MIC_P	Audio	MIC input, positive
6	MIC_BIAS	Audio	MIC Power Supplies
7	SPK_LP	Audio	Headphone/speaker differential L output, positive
8	SPK_LN	Audio	Headphone/speaker differential L output, negative
12	SPK_RN	Audio	Headphone/speaker differential R output, negative
13	SPK_RP	Audio	Headphone/speaker differential R output, positive
19	VDD	VDD	Power supply for I/O ports, DC 3.3V
20	GND	GND	GND
21	LED2	I/O	output 1KHZ square wave when not connected with phone, output high level when connected with phone.
22	LED1	I/O	output low level when not connected with headphone, output high level when connected with headphone.
23	RESET	I	External reset input: active Low
31	UART_TX	O	UART TX
32	UART_RX	I	UART RX
35	ANT	ANT	external antenna

Hardware Design Notes

The simple test of the module only needs to connect VDD/GND/UART_RX/UART_TX to use
After drawing the schematic diagram, please send it to Feasycom for review, so as to prevent the Bluetooth distance from not reaching the best effect

Function Description

Compare related products

Compare related products
Module	Version	Chip	Audio Interface	Connection maximum	Descreption
BT936D	5.2	FSC	Analog	3	Integrated transmission and reception,1 phone + 2 headset,Mainly recommend two wheeled vehicles
BT930	5.2	FSC	Analog	2	Integrated transmission and reception,1 phone + 1 headset,Mainly recommend two wheeled vehicles
BT936B	5.2	CSR8811	I2S	2	2 headset,Mainly recommend two wheeled vehicles
BT906	5.2	CSR8811	I2S	2	2 headset,Suspend production
BT966	5.1	CYW20706	Analog/I2S	1	car audio launch scene
BT1036	5.2	FSC	Analog/I2S	1	Low end audio transmission
BT1035	5.2	QCC3056	Analog/I2S	1	support APTX-LL、APTX-AD、APTX-HD,used for high sound quality

Note

The BT930 and BT936D modules support simultaneous transceiver operation. When no headset is connected, the mobile phone plays music and plays it locally. When the headset is connected, the sound is automatically transmitted to the headset.
BT90X series modules have been discontinued. Corresponding replacement modules::BT901->BT936A, BT906->BT936B,BT909->BT909C
BT806 series transmission module replacement::BT806->BT1035

Profiles & Features

SPP (Serial Port Profile)
GATTS (Generic Attribute Profile LE-Peripheral role)
GATTC (Generic Attribute Profile LE-Central role)
HFP-HF (Hands-Free Profile)
HFP-AG (Hands-Free-AG Profile)
A2DP-Sink (Advanced Audio Distribution Profile)
A2DP-Source (Advanced Audio Distribution Profile)
AVRCP-Controller (Audio/Video remote controller Profile)
AVRCP-Target (Audio/Video remote controller Profile)
HID-DEVICE (Human Interface Profile)
PBAP (Phonebook Access Profile)

GATT Throughput Service

Service : 0000B360-D6D8-C7EC-BDF0-EAB1BFC6BCBC
Write、Notify : 0000B362-D6D8-C7EC-BDF0-EAB1BFC6BCBC

Command Description

Terms

Throughout this specification:
Content between { } is optional
Content behind << represents a COMMAND from Host
Content behind >> represents a RESPONSE/EVENT to Host

Command Format

AT+Command{=Param1{,Param2{,Param3…}}}<CR><LF>

All commands start with “AT”, end with <CR><LF>
<CR> means “carriage return”, corresponds to hex value 0x0D
<LF> means “line feed”, corresponds to hex value 0x0A
If Command has Parameter, Parameter follows behind ‘=’
If Command has multiple Parameters, Parameter must be separated by ‘,’
If Command has Response, Response starts with <CR><LF>, ends with <CR><LF>
Module will always report command’s execution result by using “OK” for success or “ERR<code>” for failure

Error Code	Meaning
001	Failed
002	Invalid parameter
003	Invalid state
004	Command mismatch
005	Busy
006	Command not supported
007	Profile not turned on
008	No memory
Others	Reserved for future use

Example:Read module’s BR/EDR local name
<< AT+VER
>> +NAME=FSC-BT936D-0123
>> OK

Example:Pick up an incoming call when no call incoming actually
<< AT+HFPANSW
>> ERR003

Event Format

<CR><LF>+Indication{=Param1{,Param2{,Param3…}}}<CR><LF>

All Events start with <CR><LF>, end with <CR><LF>
If Event has Parameter, Parameter follow behind ‘=’
If Event has multiple Parameters, Parameter must be separated by ‘,’
Use command AT+SEP to replace default separator for conflict prevention
For some events, use “-”、”~” to replace “+”

Example:
Received “1234567890” from mobile phone via SPP profile
>> +SPPDATA=10,1234567890

Example:
Dial number “10086” using a mobile phone when HFP connected
>> +HFPSTAT=4,3,3
>> +HFPAUDIO=1,0,0
>> +HFPCID=10086
>> +HFPSTAT=6,3,6

Example:
First earphone HFP connection successful
>> -HFPDEV=ABCD12347890,AirPods

Commands Table

General Commands

AT+SEP - Read/Write Event separator

Command	AT+SEP{=Param}
`Param`	set range: 0x01~0xFF,default: ‘,’ ,Where ‘0’ indicates 0xFF
Response	Returns the current separator
Description	The parameters for events/responses may contain the same value as the default separator Use this command to replace the default separator for conflict prevention (Usually replace the default separator “, “with the hexadecimal value” xFF”)

Example: Read the module pairing record
<< AT+PLIST
>> +PLIST=1,32808,1C5CF226D773, Tony, iPhone12
>> +PLIST=2,40, A0BC30075421, Samsung S8
>> +PLIST=E
>> OK

Example: Set separator to ‘0xFF’
<< AT+SEP=0
>> OK

Example: Read the module pairing record again
<< AT+PLIST
>> +PLIST=1<FF>32808<FF>1C5CF226D773<FF>Tony, iPhone12
>> +PLIST=2<FF>40<FF> A0BC30075421<FF>Samsung S8
>> +PLIST=E
>> OK

AT+VER - Get Firmware Version

Command	AT+VER
Response	+VER=Param1,Param2,Param3
`Param1`	Module type
`Param2`	Firmware version
`Param3`	Data of production
Note	The date of production in response will not be changed after firmware upgrade

Example:
<< AT+VER
>> +VER=BT936D,V1.0.2,20230802
>> OK

AT+BAUD - Get/Set Uart Baudrate

Command	AT+BAUD{=Param}
`Param`	baudrate (2400/4800/9600/19200/38400/57600/128000/230400/ 256000/460800/512000/921600/1382400, default:115200)
Response	+BAUD=Param
`Param`	baudrate
Description	Module will change baudrate to target value immediately

Example:
Query baudrate
<< AT+BAUD
>> +BAUD=115200
>> OK

Change baudrate
<< AT+BAUD=9600
>> OK

AT+MICGAIN - Get/Set Analog Input Gain

Command	AT+MICGAIN{=Param}
`Param`	Gain (0~15, default:8), Support ‘+’, ‘-’ adjustment
Description	Adjust input volume

AT+SPKVOL - Get/Set Analog Output Volume

Command	AT+SPKVOL{=Param}
`Param`	VOL (0~15, default:12), Support ‘+’, ‘-’ adjustment
Description	Adjust output volume
Note	Adjust the volume of the call during the call, otherwise adjust the volume of the music

AT+REBOOT - Soft Reboot

Command	AT+REBOOT
Response	OK
Description	Module release all Bluetooth connections with remote device then reboot

Example:
<< AT+RESTORE
>> OK

AT+RESTORE - Restore Factory Settings

Command	AT+RESTORE
Response	OK
Description	Module restore all factory settings then reboot

Example:
<< AT+RESTORE
>> OK

AT+PROFILE - Bluetooth Profile Selection

Command	AT+PROFILE{=Param}
`Param`	A base-10 representation of a bit field, for each bit:
`BIT[0]`	SPP (Serial Port Profile)
`BIT[1]`	GATT Server (Generic Attribute Profile)
`BIT[2]`	GATT Client (Generic Attribute Profile)
`BIT[3]`	HFP-HF (Hands-Free Profile Handsfree)
`BIT[4]`	HFP-AG (Hands-Free Profile Audio Gateway)
`BIT[5]`	A2DP Sink (Advanced Audio Distribution Profile)
`BIT[6]`	A2DP Source (Advanced Audio Distribution Profile)
`BIT[7]`	AVRCP Controller (Audio/Video remote controller Profile)
`BIT[8]`	AVRCP Target (Audio/Video remote controller Profile)
`BIT[9]`	HID Keyboard (Human Interface Profile)
`BIT[10]`	PBAP Server (Phonebook Access Profile)
`BIT[15]`	iAP2 (For iOS devices)
Response	+PROFILE=Param
Description	This command does not need to be set,

Example:Read current profile selection
<< AT+PROFILE
>> +PROFILE=1531

AT+DEVSTAT - Read device status

Command	AT+DEVSTAT
Response	+DEVSTAT=Param
`Param`	A base-10 representation of a bit field,
`BIT[0]`	0: Power Off; 1: Power On
`BIT[1]`	0: BR/EDR Not Discoverable; 1: BR/EDR Discoverable
`BIT[2]`	0: BLE Not Advertising; 1: BLE Advertising
`BIT[3]`	0: BR/EDR Not Scanning; 1: BR/EDR Scanning
`BIT[4]`	0: BLE Not Scanning; 1: BLE Scanning

Example:usual combination and description

0	Device power off
1	Device power on
3	Device power on, BR/EDR Discoverable
5	Device power on, BR/EDR Not Discoverable, BLE Advertising
7	Device power on, BR/EDR Discoverable, BLE Advertising
13	Device power on, BR/EDR Not Discoverable, BLE Advertising, Scanning nearby BR/EDR devices

AT+ADDR - Get BR/EDR MAC Address

Command	AT+ADDR
Response	+ADDR=Param
`Param`	Module’s BR/EDR MAC address (12 Bytes ASCII)

Example:
<< AT+ADDR
>> +ADDR=DC0D30010203
>> OK

AT+LEADDR - Get BLE MAC Address

Command	AT+LEADDR
Response	+LEADDR=Param
`Param`	Module’s LE MAC address (12 Bytes ASCII)

AT+NAME - Get/Set BR/EDR Local Name

Command	AT+NAME{=Param1{,Param2}}
`Param1`	BR/EDR local name(1~31 Bytes ASCII)
`Param2`	MAC address suffix(0/1,default:1) 0: Disable suffix 1: Enable suffix “-XXXX” (lower 4 bytes of MAC address) after local name 2: Enable suffix “-XXXXXX” (lower 6 bytes of MAC address) after local name
Response	+NAME=Param
`Param`	Bluetooth Name
Description	Write local name if parameter exist, otherwise read current local name

Example:Read current BR/EDR local name
<< AT+NAME
>> +NAME=FSC-BT936D-XXXX
>> OK

Example:Change module’s BR/EDR local name to “ABC”,and disable suffix
<< AT+NAME=ABC,0
>> OK

Example:Change module’s BR/EDR local name to “ABC” and enable suffix
<< AT+NAME=ABC,1
>> OK

AT+LENAME - Get/Set BLE Local Name

Command	AT+LENAME{=Param1{,Param2}}
`Param1`	BLE local name(1~25 Bytes ASCII)
`Param2`	MAC address suffix(0/1,default:1) 0: Disable suffix 1: Enable suffix “-XXXX” (lower 4 bytes of MAC address) after local name 2: Enable suffix “-XXXXXX” (lower 6 bytes of MAC address) after local name
Response	+LENAME=Param

AT+SSP - Get/Set BR/EDR Pairing Mode

Command	AT+SSP{=Param}
`Param`	Pairing mode (0~3, default:2) (0) Legacy pairing, use pin code for pairing (1) Secure simple pairing, auto pairing (2) Secure simple pairing, display yes/no in pairing (3) Secure simple pairing, passkey compare, user need to accept/reject pair request with command AT+CFM
Response	+SSP=Param
Note	need reboot

AT+PIN - Get/Set BR/EDR Pin Code

Command	AT+PIN{=Param}
`Param`	Pin code(4~15 Bytes ASCII, default:0000)
Response	+PIN=Param
Description	Pin code only work in legacy pairing mode, see AT+SSP

Example:Read module’s pin code
<< AT+PIN
>> +PIN=0000
>> OK

Example: Change module’s pin code to “1234”
<< AT+PIN=1234
>> OK

AT+CFM - Accept/Reject Remote Pairing Request

Command	AT+CFM=Param1, Param2
`Param1`	12 Bytes MAC address of remote device
`Param2`	0-Reject remote pairing request 1-Accept remote pairing request
Description	Only used for pairing request in pairing mode 3, see AT+SSP

AT+PAIR: Get/Set BR/EDR/BLE Visibility

Command	AT+PAIR=Param
`Param`	Mode(0-3) 0: Leave BR/EDR/BLE discoverable mode (stop advertising/broadcasting) 1: Enter BR/EDR discoverable mode (start broadcasting) 2: Enter BLE discoverable mode (start advertising) 3: Enter BR/EDR/BLE discoverable mode (start advertising/broadcasting)
Description	Module will always be discoverable if no device connected (BR/EDR or BLE), and be undiscoverable if connected with remote device, unless received this command

AT+PAGE: Get/Set BR/EDR Connectability

Command	AT+PAGE=Param
`Param`	Mode(0-1) 0: Leave BR/EDR connectable mode (stop paging) 1: Enter BR/EDR connectable mode (start paging)
Description	Module will always be connectable mode if no device connected, and be unconnectable if connected with remote device, unless received this command

AT+SCAN - Scan Nearby Devices

Command	AT+SCAN=Param1{,Param2{,Param3}}
`Param1`	scan type(0~3) 0: Stop scan 1: Scan nearby BR/EDR devices 2: Scan nearby BLE devices
`Param2`	(1~48)Scan period. unit:1.28s, default:12.8s
`Param3`	(1~25 Bytes ASCII)Name filter. Filter scan results with name if set
`Param4`	EDR:(1~25 Bytes ASCII)COD filter. BLE:1-Scan tire pressure equipment
Description	Format description reference: +SCAN - Scan Result +HFPSTAT - HFP State

AT+RSSI: Get BR/EDR Signal Strength

Command	AT+RSSI=Param
`Param`	12 Bytes MAC address of current connected device
Response	+PIN=Param
`Param`	RSSI value (-127 ~ 0)

AT+PLIST - Get/Delete Paired List

Command	AT+PLIST{=Param}
`Param`	(0/1~8/12 Bytes MAC address) (0) Clear all paired record (1~8) Clear specific paired record with index (MAC) Clear specific paired record with MAC address
Response1	+PLIST=Param1, Param2, Param3{,Param4}
`Param1`	(1~8) Paired device’s index
`Param2`	A base-10 representation of a bit field, support profiles of device, see AT+PROFILE
`Param3`	(MAC) Paired device’s MAC address
`Param4`	(UTF8) Paired device’s name
Response2	+PLIST=E End of the paired record

Example:Read module’s paired record
<< AT+PLIST
>> +PLIST=1,32808,1C5CF226D773, iPhone12
+PLIST=2,40, A0BC30075421, Samsung S8
+PLIST=E
>> OK

Example:Clear module’s paired record
<< AT+PLIST=0
>> OK

AT+DSCA - Release All Connections

Command	AT+DSCA{=Param}
`Param`	(0/1/12 Bytes MAC address) (0) Disconnect Bluetooth from phone (1) Disconnect Bluetooth from headphones (MAC) Disconnect from specified MAC address Disconnect all connected Bluetooth if no parameter set
Description	Module release all Bluetooth connections with remote device

Module release all Bluetooth connections with remote device

Command	AT+AUDROUTE{=Param}
`Param`	Note: HF1 & HF2 means peer Bluetooth headphones 0 Stop audio routing 1 Route music (a2dp streaming) from Module to HP1/HP2 simultaneously 2 Route voice call (hfp sco) between Module and HP1 3 Route voice call (hfp sco) between Module and HP2 4 Route voice call (hfp sco) between HP1 and HP2 (intercom mode) 5 Route voice call (hfp sco) from Module to HP1/HP2 simultaneously 6 Route music (a2dp streaming) from Module to HP1 only 7 Route music (a2dp streaming) from Module to HP2 only
Description	Some route mode require specify firmware version, BT936D only supports call switch by sending AUDROUTE=2,3 refer to application note for more description: Source mode connection

AT+FOCUS - Select connected audio devices

Command	AT+FOCUS{=Param1{,Param2}}
`Param1`	(12 Bytes ASCII)MAC address of target device/headphone 1
`Param2`	(12 Bytes ASCII)MAC address of target device/headphone 2
Decription	BT936B/BT906/BT936D supports linking two earphones, BT930 only supports linking one earphone

Example: Connect headphone 1
<< AT+FOCUS=7C9A1DA36B41
>> OK

Example: Clear link addresses and pairing records
<< AT+FOCUS=0
>> OK

HFP Commands

AT+HFPSTAT - Read HFP State

Command	AT+HFPSTAT
Response	+HFPSTAT=Param1{,Param2{,Param3}}
Description	Format description reference: +HFPSTAT - HFP State

AT+HFPCONN - Establish HFP Connection

Command	AT+HFPCONN{=Param}
`Param`	MAC address of target device (12 Bytes ASCII)
Description	Reconnect to last HFP device if parameter not exist

Example:Connect to last HFP device
<< AT+HFPCONN
>> OK

Example:Connect to specific HFP device with MAC address
<< AT+HFPCONN=1C5CF226D773
>> OK

AT+HFPDISC - Release HFP Connection

Command	AT+HFPDISC
Description	Release current HFP connection with remote device

AT+HFPDIAL - Dial/Redial Phone Number

Command	AT+HFPDIAL{=Param}
`Param`	Phone number (1~25 Bytes ASCII)
Description	Dial specific number if parameter exist, otherwise redial

Example:Redial
<< AT+HFPDIAL
>> OK

Example:Dial number “075527924639”
<< AT+HFPDIAL=075527924639
>> OK

AT+HFPDTMF - Send DTMF code

Command	AT+HFPDTMF{=Param}
`Param`	*DTMF (0~9/#/)**

Example:Send DTMF code “#” while talking
<< AT+HFPDTMF=#
>> OK

AT+HFPANSW - Pick Up Incoming Call

Command	AT+HFPANSW
Description	Pick up an incoming call

AT+HFPCHUP - Reject/Hung up Call

Command	AT+HFPCHUP
Description	Reject incoming call or hung up outgoing/active call

AT+HFPADTS - Transfer Voice Audio Between Local and Remote Device

Command	AT+HFPADTS=Param
`Param`	1: Transfer voice audio from module to remote device 2: Transfer voice audio from remote device to module
Description	Transfer voice audio between module and remote device by default if no parameter set

AT+HFPVR - Start/Stop Voice Recognition of Remote Device

Command	AT+HFPVR=Param
`Param`	0-Stop 1-Start
Description	Start/Stop Voice Recognition of Remote Device (such as Siri for iOS devices)

AT+HFPINFO - Read HFP information

Command	AT+HFPINFO
Description	Return the current HFP status, signal strength, battery, device name, etc.

AT+MICMUTE - Mute Mic

Command	AT+MICMUTE=Param
`Param`	0-unmute 1-mute
Description	mute mic when call active

A2DP/AVRCP Commands

AT+A2DPSTAT - Read A2DP State

Command	AT+A2DPSTAT
Response	+A2DPSTAT=Param
Description	Format description reference: +A2DPSTAT - A2DP State

AT+A2DPCONN - Establish A2DP Connection

Command	AT+A2DPCONN{=Param}
`Param`	MAC address of target device (12 Bytes ASCII)
Description	Reconnect to last A2DP device if parameter not exist

AT+A2DPDISC - Release A2DP Connection

Command	AT+A2DPDISC
Description	Release current A2DP connection with remote device

AT+A2DPINFO - Read A2DP information

Command	AT+A2DPINFO
Description	Return the current A2DP status, remote device name , etc.

AT+AVRCPSTAT - Read AVRCP State

Command	AT+AVRCPSTAT
Response	+AVRCPSTAT=Param
Description	Format description reference: +AVRCPSTAT - AVRCP State

AT+AVRCPCFG - Get/Set AVRCP Configuration

Command	AT+AVRCPCFG{=Param}
`Param`	A base-10 representation of a bit field, default:3, for each bit:
`BIT[0]`	Auto get track ID3 information (title, artist, album) on track changed.default:1
`BIT[1-3]`	Auto get track play progress if value > 0. default:1 second
`BIT[4]`	Browsing function enable/disable
`BIT[5]`	Auto pull media cover art image to specify folder

Example: Read AVRCP configuration

<< AT+AVRCPCFG

>> +AVRCPCFG=1

OK

Example: Get track play progress every 5 second
<< AT+AVRCPCFG=9
>> OK

AT+PLAYPAUSE - Track Play/Pause

Command	AT+PLAYPAUSE
Description	Send play or pause command to remote media player according to current play status

AT+PLAY - Track Play

Command	AT+PLAY
Description	Send play command to remote media player

AT+PAUSE - Track Pause

Command	AT+PAUSE
Description	Send pause command to remote media player

AT+STOP - Track Stop

Command	AT+STOP
Description	Send stop command to remote media player

AT+FORWARD - Track Forward

Command	AT+FORWARD
Description	Send forward command to remote media player

AT+BACKWARD - Track Backward

Command	AT+BACKWARD
Description	Send backward command to remote media player

PBAP Commands

AT+PBSTAT - Read PBAP state

Command	AT+PBSTAT
Response	+PBATAT=Param
Description	Format description reference: +PBSTAT - PBAP status

AT+PBCONN - Establish PBAP Connection

Command	AT+PBCONN{=Param}
`Param`	MAC address of target device (12 Bytes ASCII)
Description	Module will use current HFP device’ MAC address if parameter not exist For some firmware release, module will establish PBAP connection automatically on received command AT+PBDOWN

AT+PBDISC - Release PBAP Connection

Command	AT+PBDISC
Description	Release current PBAP connection with remote device

AT+PBDOWN - Download Phonebook

Command	Param1{, Param2{, Param3{, Param4}}}
`Param1`	Phonebook type(0-5) (0) Phonebook (SIM Storage) (1) Phonebook (Phone Storage) (2) Received call log (3) Dialed call log (4) Missed call log (5) All call log
`Param2`	Max items (1~65535, default:3000 for phonebook; 50 for call log)
`Param3`	Phonebook format (defaut:0) (0) Family Name, Middle Name, Given Name (1) Given Name, Middle Name, Family Name (2) Raw vCard 2.1
`Param4`	Contact photo required (0/1)
Description	For some phones (e.g. iPhone), the contact download permission must be turned on in phone’s Bluetooth settting refer to application note for more description: Phonebook downloading

AT+PBABORT - Abort Downloading

Command	AT+PBABORT
Description	Abort downloading

SPP Commands

AT+SPPSTAT - Read SPP State

Command	AT+SPPSTAT
`Param`	+SPPATAT=Param
Description	Format description reference: +SPPSTAT - SPP State

AT+SPPCONN - Establish SPP Connection

Command	AT+SPPCONN{=Param}
`Param`	MAC address of target device (12 Bytes ASCII)

AT+SPPDISC - Release SPP Connection

Command	AT+SPPDISC
Description	Release current SPP connection with remote device

AT+SPPSEND - Send Data Via SPP

Command	AT+SPPSEND=Param1,Param2
`Param1`	Payload length (1~492)
`Param2`	Payload (1~492 Bytes UTF8)
Description	If throughput mode is on, this command is de-active

Example: Send data “1234567890” to remote device via SPP
<< AT+SPPSEND=10,1234567890
>> OK

GATT Commands

AT+GATTSTAT - Read GATT State

Command	AT+GATTSTAT
Response	+GATTATAT=Param
Description	Format description reference: +GATTSTAT - GATT State

AT+GATTDISC - Release GATT Connection

Command	AT+GATTDISC
Description	Release current GATT connection with remote device

AT+GATTSEND - Send Data Via GATT

Command	AT+GATTSEND=Param1,Param2
`Param1`	Payload length (1~492)
`Param2`	Payload (1~492 Bytes UTF8)
Description	If throughput mode is on, this command is de-active

Example: Send data “1234567890” to remote device via GATT
<< AT+SPPSEND=10,1234567890
>> OK

Event Table

General Events

+PWRSTAT - Powering State

Format1	+PWRSTAT=Param
`Param`	0-Powering off 1-Powering on(booting)
Description	AT Command is not recommended to be used while powering on/off state

+SCAN - Scan Result

Format1	+SCAN=Param1,Param2,Param3,Param4,Param5,Param6
`Param1`	Index
`Param2`	RSSI (-127 ~ -1)
`Param3`	Device address type (0~3) (0) BR/EDR address (1) LE public address (2) LE random address (3) iOS device with Carplay support
`Param4`	MAC address (12 Bytes ASCII)
`Param5`	Device Name for BR/EDR devices or advertising data for LE devices
`Param6`	Class of device(6 Bytes ASCII)
Format2	+SCAN=E: Scan stopped

Example: Scan BR/EDR nearby devices
<< AT+SCAN=1
>> OK
>> +SCAN=1,-32,3,B019C66209FA,wt-iphone,7A020C
>> +SCAN=2,-74,0,DC0D30000053,BW226,040680
>> +SCAN=3,-43,0,00158354F994,LAPTOP-3L,120104
>> +SCAN=E

+ADV - Tire pressure scanning results

Format1	+ADV=Param
`Param`	The first 12 bytes are the tire pressure address, and the following data are tire pressure data

Example: Scan tire pressure device named TPMS for a duration of 1 minute

<< AT+SCAN=2,60,TPMS,1

>> OK +DEVSTAT=23

+ADV=EF89ED86324E685A00010000010101061D49990000

+PAIRREQ - Pair Request

Format	+PAIRREQ=Param1,Param2{,Param3}
`Param1`	Passkey (000000~999999)
`Param2`	MAC address (12 Bytes ASCII) of current pairing device
`Param3`	Name of current pairing device

+PAIRED - Pair Result

Format	+PAIRED=Param1,Param2
`Param`	Pair result (0)-Success (1~255)-Failed reason
`Param2`	MAC address (12 Bytes ASCII) of current pairing device

+SPKVOL - Output volume level

Format1	+SPKVOL=Param1,Param2
`Param1`	A2DP’s volume level
`Param2`	HFP’s volume level

HFP Events

+HFPSTAT - HFP State

Format	+HFPSTAT=Param1{,Param2{,Param3}}
`Param1`	(0~10) The HFP status which connected with phone bluetooth (0) Unsupported (1) Standby (2) Connecting (3) Connected (4) Outgoing call (5) Incoming call (6) Active call
`Param2`	The status is the same as above, the status of the first Bluetooth earphone HFP
`Param3`	The status is the same as above, the status of the second Bluetooth earphone HFP

Example: Dial number 10086
<< AT+HFPDIAL=10086
>> +HFPSTAT=4,1,1
>> +HFPAUDIO=1,0,0
>> +HFPCID=10086
>> +HFPCIE=10086

Example: Incoming call with number 13265463800
>> +HFPSTAT=5,1,1
>> +HFPCID=13265463800
>> +HFPCIE=tony
>> +HFPAUDIO=1,0,0

+HFPCID - Incoming/Outgoing call number

Format	+HFPCID=Param
`Param`	(1~25 Bytes ASCII), call number

+HFPCIE - Incoming/Outgoing call number remark

Format	+HFPCID=Param
`Param`	(UTF8), call number remark

+HFPDEV - HFP Remote Device Information

Format	+HFPDEV=Param1{,Param2}
`Param1`	12 Bytes ASCII), Remote MAC address of current HFP connection
`Param2`	(UTF8), Remote device name of current HFP connection
Note	When indicating - HFPDEV, it represents the information of the first headphone, when indicating ~ HFPDEV, it represents the information of the second headphone

Example: HFP connect with device successfully >> +HFPDEV=1C5CF226D774,iPhone

+HFPAUDIO - HFP Voice Audio State

Format	+HFPAUDIO=Param1,Param2,Param3
`Param`	HFP audio status which connected with phone bluetooth (0) HFP voice audio disconnected, audio input/output routed to remote device (1) HFP voice audio connected, audio input/output routed to module
`Param2`	The status is the same as above, the audio status of the first Bluetooth earphone HFP
`Param3`	The status is the same as above, the audio status of the second Bluetooth earphone HFP

+HFPSIG - HFP Remote Device Network Signal Strength

Format	+HFPSIG=Param
`Param`	(0~5)Network signal strength of remote device

+HFPBATT - HFP Remote Device Battery Level

Format	+HFPBATT=Param1,Param2,Param3
`Param1`	(-1~5) Remote device battery level, mobile phone battery level
`Param2`	(-1~5) Remote device battery level, the first headphone battery level
`Param3`	(-1~5) Remote device battery level, the second headphone battery level
Note	-1 indicates that the battery level is not be obtained

+HFPNET - HFP Remote Device Network Operator Selection

Format	+HFPNET=Param
`Param`	（UTF8）Network operator selection of remote device

+HFPMANU - HFP Remote Device Manufacture

Format	+HFPMANU=Param
`Param`	（UTF8）Manufacture name of remote device

+HFPNUM - HFP Remote Device Phone Subscriber Number

Format	+HFPNUM=Param
`Param`	(ASCII)Phone subscriber number of remote device

+HFPIBR - HFP Remote Device In-band-ring Support

Format	+HFPIBR=Param
`Param`	(0/1) In-band-ring support
Description	Report whether the current connected phone support in-band-ring

+HFPRING - HFP Remote Device Ringing

Format	+HFPRING=Param
`Param`	(0/1) In-band-ring off/on
Descreption	Phone is ringing when call incoming, the host platform should play a local ringtone if in-band-ring not supported by remote mobile phone

+HFPVR - Wake up HFP remote voice device

Format	+HFPVR=Param
`Param`	0-Stop wake-up voice 1-wake up voice
Description	This event is used to indicate the wake-up of remote voice devices, such as Siri

A2DP/AVRCP Events

+A2DPSTAT - A2DP State

Format	+HFPMANU=Param
`Param1`	The A2DP status of connecting with phone bluetooth (0) Unsupported (1) Standby (2) Connecting (3) Connected (4) Paused (5) Streaming
`Param2`	The status is the same as above, the A2DP status of the first Bluetooth earphone
`Param3`	The status is the same as above, the A2DP status of the second Bluetooth earphone

+A2DPDEV - A2DP Remote Device Information

Format	+A2DPDEV=Param1{,Param2}
`Param1`	(12 Bytes ASCII), Remote device’s MAC address of current A2DP connection
`Param2`	(UTF8), Remote device’s name of current A2DP connection
Note	When indicating - A2DPDEV, it represents the information of the first headphone, when indicating ~ A2DPDEV, it represents the information of the second headphone

+AVRCPSTAT - AVRCP State

Format	+AVRCPSTAT=Param1,Param2,Param3
`Param1`	The AVRCP status of connecting with phone bluetooth (0) Unsupported (1) Standby (2) Connecting (3) Connected
`Param2`	The status is the same as above, the AVRCP status of the first Bluetooth earphone
`Param3`	The status is the same as above, the AVRCP status of the second Bluetooth earphone,only one AVRCP connection with headphones is supported currently

+PLAYSTAT - Media Player State

Format	+PLAYSTAT=Param
`Param`	(0) Stopped (1) Playing (2) Paused (3) Fast Forwarding (4) Fast Rewinding

+TRACKSTAT - Media Player Play Progress

Format	+TRACKSTAT=Param1,Param2,Param3
`Param1`	(0~4), Media Player State, see +PLAYSTAT
`Param2`	(Decimal ASCII),Elapsed time of current track in second
`Param3`	(Decimal ASCII),Total time of current track in second

+TRACKINFO - Media Track Information

Format	+TRACKINFO=Param1,Param2,Param3
`Param1`	title
`Param2`	artist
`Param3`	album

Example: Phone playing song “Creep-Radio Head”

>> +TRACKINFO=Creep , Radiohead , Pablo Honey

+CTPAUSE - Pause

Description

Remote device sends pause command

+CTPLAY - Play

Description

Remote device(bluetooth headphone) sends play command

+CTSTOP - Stop

Description

Remote device(bluetooth headphone) sends stop command

+CTBACK - Return to previous track

Description

Remote device (Bluetooth headset) sends command to return to previous track

+CTFWD - Play next trak

Description

Remote device (Bluetooth headset) sends command to play next track

PBAP Events

+PBSTAT - PBAP status

Format	+PBSTAT=Param
`Param`	(0) Unsupported (1) Standby (2) Connecting (3) Connected (4) Downloading

+PBCNT - Phonebook Entries of Remote Device

Format	+PBCNT=Param
`Param`	Phonebook entries of remote device

+PBDATA - Phonebook data

Format1	+PBDATA=Param1,Param2,Param3{,Param4}
`Param1`	Type (0) Phonebook (SIM Storage) (1) Phonebook (Phone Storage) (2) Received call log (3) Dialed call log (4) Missed call logg
`Param2`	Call number remark
`Param3`	Call number
`Param4`	+PBCNT - Phonebook Entries of Remote Device Format: Year(4Bytes) Month(2Bytes) Day(2Bytes) T(1Byte) Hour(2Bytes) Minute(2Bytes) Second(2Bytes). e.g. 20161012T152826 represents 2016/10/12/15/28/26
`Format2`	+PBDATA=E: Download complete
Descreption	Call time may not exist for some mobile phones

Example: Download all phonebook
<< AT+PBDOWN=1
>> +PBCNT=234
+PBDATA=1 , Jack , 18219146201
+PBDATA=1 , kenan , 8613771972680
……
+PBDATA=E

Example: Download 10 dialed call log
<< AT+PBDOWN=3,10
>> +PBDATA=3 , China Mobile , 10086 , 20171013T103516
+PBDATA=3 , Jerry , 18688967507 , 20171012T152826
……
+PBDATA=E

SPP Events

Note

Events for iAP2 (Apple Accessory Protocol) and AAP (Android Auto Protocol) are almost the same with SPP, which are:

+IAPSTAT, +IAPDATA for iAP2 profile
+AAPSTAT, +AAPDATA for AAP profile

Document will omit these events.

+SPPSTAT - SPP State

Format	+SPPSTAT=Param
`Param`	(0) Unsupported (1) Standby (2) Connecting (3) Connected

+SPPDATA - SPP Received Incoming Data

Format	+SPPDATA=Param1,Param2
`Param1`	Payload length
`Param2`	Payload

Example: Received data “1234567890” from remote device via SPP

<< +SPPDATA=10,1234567890

GATT Events

+GATTSTAT - GATT State

Format	+GATTSTAT=Param
`Param`	(0) Unsupported (1) Standby (2) Connecting (3) Connected

+GATTDATA - GATT Received Incoming Data

Format	+SPPDATA=Param1,Param2
`Param1`	Payload length
`Param2`	Payload

Example: Received data “1234567890” from remote device via GATT

<< +GATTDATA=10,1234567890

Application scenarios

profiles initializing and change parameter

The following figure shows Profile initialization and name modification

MCU change device name CARKIT reference code:

void change_name(void)
{
    uart_send("AT+NAME\r\n");
    if(uart_read("+NAME",name_buf))
    {
        if(memcmp(name_buf,"CARKIT",6))
        {
            uart_send("AT+NAME=CARKIT,0\r\n");      //defalut disable MAC address suffix
            uart_send("AT+NAME\r\n"); // read bt name
            if(uart_read("+NAME",name_buf))
            {
                if(memcmp(name_buf,"CARKIT",6))
                {
                    //change name fail
                }
                else
                {
                    //change name success
                }
            }
        }
    }
}

Sink mode connection

Note

BT930、BT936D module supoort sink mode

Source mode connection

@startuml
hide footbox
skinparam sequenceMessageAlign center

box #LightBlue
participant Host as host
participant Blueware as bt
end box

rnote over host, bt: scan nearby headset

host -> bt: AT+SCAN=1
bt -> host: +SCAN=1,-56,0,FF733EEF25E9,N-612,240408
bt -> host: +SCAN=2,-78,0,7C9A1DA36B41,AirPods,240404
bt -> host: +SCAN=E

rnote over host, bt: （add 2 device to foucu list）
host -> bt: AT+FOCUS=FF733EEF25E9,7C9A1DA36B41
bt -> host: +A2DPSTAT=3,3,1 (devA a2dp connected)
bt -> host: +A2DPSTAT=3,3,3 (devB a2dp connected)
bt -> host: +HFPSTAT=3,3,1 (devA hfp connected)
bt -> host: +HFPSTAT=3,3,3 (devB hfp connected)

bt -> host: +HFPSTAT=3,1,1 （HFP connected）
bt -> host: +HFPSIG=3
bt -> host: +HFPBATT=4,-1,-1
bt -> host: +HFPROAM=0
bt -> host: +HFPNUM=8618620277271
bt -> host: +HFPMANU=AppleInc.
host -> bt: AT+PLAY (send music play command to phone)

bt -> host: +A2DPSTAT=5,4,4 (a2dp streaming)
bt -> host: +A2DPSTAT=5,5,4 (devA a2dp streaming)
bt -> host: +A2DPSTAT=5,5,5 (devB a2dp streaming)
host -> bt: AT+PAUSE(send music pause command to phone)

bt -> host: +A2DPSTAT=4,5,5 (a2dp pause)
bt -> host: +A2DPSTAT=4,4,5 (devA a2dp pause)
bt -> host: +A2DPSTAT=4,4,4 (devB a2dp pause)

host -> bt: AT+HFPDIAL=10086
host -> bt: AT+AUDROUTE=2 (establish devA hfp audio)
bt -> host: +HFPSTAT=4,3,3
bt -> host: +HFPAUDIO=1,0,0 (voice connected,phone)
bt -> host: +HFPAUDIO=1,1,0 (voice connected,devA)
bt -> host: +HFPCID=10086
bt -> host: +HFPCIE=10086
bt -> host: +HFPSTAT=6,6,3
host -> bt: AT+AUDROUTE=3 (establish devB hfp audio)
bt -> host: +HFPAUDIO=1,0,1 (voice connected,devA)
bt -> host: +HFPSTAT=6,3,6
host -> bt: AT+HFPCHUP
bt -> host: +HFPSTAT=3,3,3
bt -> host: +HFPAUDIO=0,0,0(voice disconnected)

@enduml

Phonebook downloading

Note

When some firmware does not support downloading, it will automatically connect to PBAP, and you need to send AT+PBCONN to connect to PBAP before downloading

Appendix

Note

If you need to upgrade to the latest version, please refer to Upgrade Over-the-Air.

Download PDF Document

Download PDF Document