An andoid phone connect to multiple ble devices

[runninghorse]

In my project, an android phone is needed to connect to two ble devices. All my ble devices are nrf51822. The android phone can connect to and receive data from every device respectively， but can't work when connecting to two devices at the same time. I created a BluetoothGatt object and a callback for each device as this thread devzone.nordicsemi.com/.../ said. The two connections were established, but the android phone could not receive the data from any device. I tested github.com/.../Android-nRF-Connect, it worked fine, but its code is not available! I even tried github.com/.../Android-nRF-Toolbox, but the Proximity Monitor could not find the two devices. Any suggestion? Should i connect in different Service or Thread?

[Hung Bui]

We need to see how you bind the BluetoothGATT to the device you connect to. Make sure you have different BluetoothGatt instance for each device. You can test first with 1 device, and make sure the CCCD is written correctly. Then you test with 2 devices. You should use a sniffer to check what exactly happens over the air. You can't track 2 devices at the same time though, but you can track one by one.

[runninghorse]

According to your suggestion, I rechecked my code and packed all the information(BluetoothGatt/BluetoothGattCallback/BluetoothAdapter) into a class BleConnection. Then it worked! Thanks!