Bluetooth, A2DP, AVRC, Audio Sink Exercise → Connecting Bluetooth Module as Bluetooth Speaker or Hands-Free to Mobile Phone
A2DP, Audio Sink
Practice using a mobile phone as an A2DP Source and a Bluetooth module as a sink device.
Note> A sink must have an audio decoder and A2DP audio channel is uni-directional.
1. Test System Configuration
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| A2DP Source | A2DP Sink | ||
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 A2DP-Sink | |||
| 1 | AT+COD=240404 | OK | Set the device type |
| 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 =163 |
OK +DEVSTAT=0 +PWRSTAT=1 +SPPSTAT=1 +VER=BT955,V2.7.0,20220810 +PROFILE=161 +A2DPMUTED=0 +A2DPSTAT=1 +AVRCPSTAT=1 +DEVSTAT=1 +DEVSTAT=3 |
Turn on A2DP Sink, AVRCP Controller
Note. if the module does not support the corresponding function, the result bit value maybe different from the setting value. |
| Step 2: Paring with Cellphone | |||
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OK +A2DPSTAT=2 +PAIRREQ=734486,948BC1350C63,Galaxy S8+ +PAIRED=0,948BC1350C63,Galaxy S8+ +A2DPSTAT=1 +A2DPSTAT=2 +PLAYSTAT=2 +A2DPSTAT=3 +A2DPDEV=948BC1350C63,Galaxy S8+ +DEVSTAT=1 +AVRCPSTAT=2 +AVRCPSTAT=3 +PLAYSTAT=0 +TRACKINFO=Not Provided, |
In case of normal connection, Displayed as “connected by audio” In the phone’s Bluetooth registration |
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| Step3. Play music on your phone | |||
| 6 |
+TRACKSTAT=1,53,538 +TRACKSTAT=1,54,538 +TRACKSTAT=1,56,538 +TRACKSTAT=1,57,538 |
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WiFi IoT Module
Bluetooth Module
5G/LTE/CAT-M1/NB-IoT
