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ESP32 Bluetooth

  2026-03-24

  Edited: 2026-03-24

Connecting to ESP32 Bluetooth is kind of weird because it uses a Serial Port Profile (SPP) which does not come with bluetoothctl profiles by default. You have to instead use rfcomm directly instead.

  1. Use bluetoothctl to trust and pair device
  2. sudo rfcomm /dev/rfcomm0 <MAC> <CHANNEL>
  3. echo <COMMAND> > /dev/rfcomm0 to send commands

You might have to use rfcomm bind /dev/rfcomm0 <MAC> first, but probably not. Use sdptool browse <MAC> to get information about the device as well as what channel you have to connect to <CHANNEL> defaults to 1 for rfcomm connect. Use rfcomm -a to get all connected devices.

You might hit permission errors when trying to echo into /dev/rfcomm0, that can probably be fixed using chmod a+rw /dev/rfcomm0, with sudo of course.