Closes https://github.com/espressif/esp-protocols/issues/37
Closes https://github.com/espressif/esp-protocols/issues/46
* BG96 needs a small pause between CMUX command reception and actual use of the CMUX mode * Correct CMUX payload reception to check FT_UIH message type (P/F flag could be cleared or set) Closes https://github.com/espressif/esp-protocols/issues/33