Add Bluetooth or BLE support

[AA6KL]

Add the BLE or Bluetooth interface support to your NanoVNA-Web-Client will help people wirelessly connect to their NanoVNA* devices without the need of USB OTG cable, and potentially reduce the interference from nearby human body.

I have the UART interface enabled on the NanoVNA-H and NanoVNA-H4. By attaching the BLE (HC-08) or Bluetooth (HC-05) module to the UART, I can use nanovna-saver on Windows and Linux to control the device. Also, I can use the shell command at Android phone with termial app to execute commands.

My firmware mod can only use either USB CDC or UART, not both. I have checked in the NanoVNA-H4 version firmware as below. I can do the same for NanoVNA and NanoVNA-H too. It may take longer time to enable both of USB and UART at the same time for me, since I am a ChibiOS newbie.

https://github.com/AA6KL/NanoVNA-H4/releases/tag/v1.3.ble

Thanks,

Ken
AA6KL

[galileo-pkm]

Since serial support is now available from multiple firmware providers
it would be beneficial to implement bluetooth support. I can also confirm
that serial over BT works without issues.