Two speaker support for BT1038

siarez

Also could you please share AT commands or programming guide for FSC-BT1104QI ?

Thank you,

FAE_Gavin

siarez BT1038 supports BIS , but its internal logic does not support converting A2DP to BIS

For your use case (phone → speaker → second speaker), we recommend BT1104QI:

Phone sends A2DP to BT1104QI
BT1104QI broadcasts via BIS (Auracast)
Other speakers/headphones receive the broadcast

This gives you true stereo with multiple receivers.

BT1104QI AT commands: FSC-BTAUD-QCC AT Command Set

siarez

FAE_Gavin Ok thank for the link to the command set.

Could you please provide the exact BT1104QI AT commands for starting BIS broadcast from incoming A2DP audio. Which command enables A2DP-to-BIS bridging on BT1104QI?

BT1026 has a TWS command set. Does that exist for BT1104QI?

FAE_Gavin

siarez

A2DP to BIS bridging
On BT1104QI, this function is enabled by setting BIT[17] in the AT+PROFILE command. Once enabled, the module's internal logic automatically converts incoming A2DP audio to BIS broadcast – no additional commands are needed.
TWS on BT1104QI
Standard firmware does not include TWS functionality. If your application requires TWS, please contact our sales team at sales@feasycom.com to discuss custom firmware options.

siarez

FAE_Gavin When a BT1104QI bridges A2DP to BIS, does the receivers (BIS sink) receive both left and right channels of the stereo stream? or is there a way to select which channel is broadcasted?

If I set BIT[19] in the AT+PROFILE does it work as a A2DP to CIS bridge? If yes, does it send both channels or just a single channel? If yes, which channel? (I'm asking because AT+CISCONN note says "This command is only valid in the mono audio broadcast mode" What does that mean?)

FAE_Gavin

siarez 1.A2DP to BIS broadcast: The module broadcasts both left and right channels (stereo). There is no built‑in way to select only one channel.

2.A2DP to CIS bridge and BIT[19]: The standard firmware does not include A2DP to CIS bridging. CIS is stereo (both channels).

siarez

FAE_Gavin understood thanks.
Can BIS on BT1104QI be protected so only authorized (i.e. whitelisted) BIS sinks can join? Or any BIS sink can join?

FAE_Gavin

siarez Any BIS sink that scans and tunes to the broadcast channel can receive the audio stream.

siarez

Got it.
So to double check, Is BT1104QI the only LE Audio module that is capable of being A2DP sink and BIS source at the same time? BT1038A or BT1038B can't do that?

FAE_Gavin

siarez BT1038 series does not support A2DP to BIS. BT1104QI is not the only one, but it is our primary recommended module for this use case.

siarez

FAE_Gavin I requested samples of BT1104QI, but apparently it is out of stock currently. I'd like to get started with the testing and development asap. So could you suggest a similar module that is in stock? I will later switch to BT1104QI when it becomes available.

FAE_Gavin

siarez Technically speaking, modules such as BT1058 also support the A2DP-to-BIS functionality you need. However, for availability, stock status, sample requests, and a definitive recommendation based on your timeline, please contact our sales team directly at [sales@feasycom.com](mailto:sales@feasycom.com). They have real-time inventory information and will help you choose the best option (including BT1058 or other alternatives) .