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CC2564MODA: Connection between sink and source Bluetooth

Part Number: CC2564MODA
Other Parts Discussed in Thread: BT-MSPAUDSINK

Hi, I have just bought a development board audio sink CC256x and a development board audio source CC256x in digikey:

Both of them work beautifully when I connect with other Bluetooth audio devices. I just turn on the audio source CC256x and it connect automatically with my Bluetooth speaker. But when I try to connect your development board CC256x sink and CC256x source it seem like they can not connect to each other. Could you tell me why?