Hi, your bluetooth module looks like HC-05/HC-06 to me, but I might be wrong. The default UART baud rate for VESC (hw 4.12, FOCBOX may be different) is 115200 but you can easily change it using BLDC tool. If your bluetooth module supports 115200 you should use this for better data throughput. To set up the module you may connect it to an Arduino or some FTDI USB breakout thing (RX pin goes to TX and vice versa, common GND). Then start the serial monitor from Arduino IDE to set up the bluetooth module using AT commands. Here is a link that helped me a lot https://arduino-info.wikispaces.com/BlueTooth-HC05-HC06-Modules-How-To
An UART bridge would look like:
(VESC) ----UART----> (BT module A) ----UART-over-BT-protocol----> (BT module B, eg. HM-05/06/10 or built-in module) ----UART----> (receiving software on phone/computer)
Both BT modules must be
paired properly (BT version has to be compatible eg. BLE will not work with non-BLE BT)
in BT pass-through mode
run at the same baud-rate (which has to be at least as fast as the VESC baud-rate)
Given that the BT types of the modules are the same the rest can be set-up easily using AT commands. Android BT stack might also add constraints. As far as I’ve read in this forum HM-10 seems to be the most compatible module.