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I'm working on a drone project using a mobile phone do send pitch/roll/throttle and yaw to a Rpi 4 2GB over bluetooth. This is no problem. But, then I want to send these values to the flightcontroller using the serial port (UART) (sending a bytearray at baudrate 115200). When run the program I get no errors from the PI, but the flightcontroller won't get any values. Is it at all possible to use BT and UART at the same time on RPi?

Svein-Tore Narvestad
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This Answer is misleading, and does not answer the Question. It is possible to use Bluetooth AND serial - use /dev/serial0 If you need to use UART0 it is still possible to use Bluetooth.

According to RPi 4 overlays readme you have to turn off Bluetooth to use UART0. You should test alternative UART pins.

Name: disable-bt

Info: Disable onboard Bluetooth on Pi 3B, 3B+, 3A+, 4B and Zero W, restoring UART0/ttyAMA0 over GPIOs 14 & 15.

N.B. To disable the systemd service that initialises the modem so it doesn't use the UART, use 'sudo systemctl disable hciuart'.

Load: dtoverlay=disable-bt

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Lukasz
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