I'm trying to connect a keyboard (link my reply below) with Bluetooth Classic 3.0 to an esp32. I want the esp32 to be the master that actively connects to the keyboard as a slave. The goal is to be able to use the keyboard to send key inputs to serial.
I have ran the bt_classic_device_discover example. The dump from BluetoothSerial.discover() looks like:
16:01:25.402 -> Starting discover...
16:01:35.397 -> >> Dump scan results:
16:01:35.397 -> - 1: Name: Bluetooth 3.0 Keyboard, Address: 20:20:01:3d:3f:95, cod: 9536, rssi: -83
16:01:35.397 -> -- Dump finished -
I tried using the SerialToSerialBTM example but it never successfully connects to the keyboard.
I set the esp32 to master with SerialBT.begin("ESP32", true); set the address like uint8_t address[] = {0x20, 0x20, 0x01, 0x3D, 0x3F, 0x95}; and then attempted to connect connected = SerialBT.connect(address); but it always fails.
I have done a lot of Google searching and tried quite a few things. I have tried setting the PIN with the common values (0000, 1111, 1234). I can successfully connect to the keyboard using my Android phone. I can also successfully connect to the esp32 with my Android phone. There is no prompt to enter a PIN when pairing the keyboard to my phone.
I have tried downgrading to 1.0.2 as was suggested in this git issue (link in my reply below) but still no success.
Does anyone have any experience or advice for connecting a device to an esp32 where the esp32 is running as master?
Would I have more success trying to do this using ESP-IDF or BTStack?
Thank you very much for anyone who takes the time to try and help.
edit: Just now I found an app that will make my Android phone go into "slave" mode and I was able to connect to it via mac address with the SerialToSerialBTM example and I sent data from the Arduino IDE serial monitor to the phone app.