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Bluetooth, HFP, Audio Gateway, AG Exercise → Full-duplex audio Exercise, Connecting Bluetooth Speaker or Hands-Free to Bluetooth Module as Cellphone.

 

HFP, AG(Audio Gateway)

Practice using a Bluetooth module as an HFP AG(Audio Gateway) and a hands-free product as an HF(Hands-Free) device.

Note. An HFP audio channel is bi-directional.

 

 

 

 

1. Test System Configuration

HFP AG   HFP HF

 

 

Profile Example

Decimal PBAP HID AVRCP A2DP HFP GATT SPP BT Role
    TRGT CTRL SRC SNK AG HF CLNT SVR  
B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
11 0 0 0 0 0 0 0 1 0 1 1 HF
19 0 0 0 0 0 0 1 0 0 1 1 AG
163 0 0 0 1 0 1 0 0 0 1 1 Sink
323 0 0 1 0 1 0 0 0 0 1 1 Source
117 0 0 0 1 0 1 0 1 0 1 1 Sink&HF
339 0 0 1 0 1 0 1 0 0 1 1 Source&AG

 

 

2. Command and Response Sequence

 

NO Command Response Description
Step1: Setting-up HFP-AG
1 AT+COD=5A020C OK Set the device type is the mobile phone(Source/AG)
2 AT+I2SCFG=0 OK

Set the audio output to Analog

If the module recognizes codec successfully,

feedback +CODEC=ID is received

3 AT + PROFILE =19

OK

+DEVSTAT=0

+PWRSTAT=1

+SPPSTAT=1

+VER=BT955,V2.7.0,20220922

+PROFILE=17

+HFPSTAT=1

+DEVSTAT=1

+DEVSTAT=3

Turn on HFP-AG

 

Note.

if the module does not support

the corresponding function,

the result bit value

may be different from the setting value.

Step2:  Pairing with AG
  Set BT Earphone to Pairing  Mode  

Switch Hans-Free to Paring Mode,

to be discoverable by AG or Cellphone

4 AT+SCAN=1

+DEVSTAT=1

+DEVSTAT=9

+SCAN=1,-67,0,8BEE15D417EC,MABT181,340404

+SCAN=2,-66,0,948BC1350C63,Galaxy S8+,5A020C

+SCAN=E

+DEVSTAT=1

 
5

 

 

AT+HFPCONN=Target

 

ex)

AT+HFPCONN=8BEE15D417EC

OK

+HFPSTAT=2

+PAIRREQ=072372,8BEE15D417EC,MABT181

+PAIRED=0,8BEE15D417EC,MABT181

+HFPSTAT=3

+HFPDEV=8BEE15D417EC,MABT181

+DEVSTAT=1

+HFPVGS=15

+HFPBATT=0

+HFPSTAT=1

+DEVSTAT=3

+HFPSTAT=2

+HFPSTAT=3

+HFPDEV=8BEE15D417EC,MABT181

+DEVSTAT=1

+HFPVGS=15

+HFPBATT=2

Connecting HF with AG
6 AT+AUDROUTE=2

+AUDROUTE=2

OK

+HFPAUDIO=1

+AUDMODE=2

+HFPSTAT=4

+HFPSTAT=6

Set Audio/Voice path to HFP

 

 

 

 

 

Adsense

 

 WiFi IoT Module

 

www.mxchip.com

 

 

 Bluetooth Module

www.feasycom.com

 

 

 5G/LTE/CAT-M1/NB-IoT

 

www.simcom.com

 

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