vshymanskyy opened a new issue, #7153:
URL: https://github.com/apache/incubator-nuttx/issues/7153

   While the PPPD example works, one needs to exit PPP mode (possibly 
power-resetting the modem) to send
   additional AT commands or read NMEA information from the GSM modems, which 
proves difficult and requires a lot of task handling.
   
   [GSM 07.10 
protocol](https://www.etsi.org/deliver/etsi_ts/101300_101399/101369/07.01.00_60/ts_101369v070100p.pdf)
 is a suggested way to handle this. It allows multiplexing (AT+CMUX) several 
logical streams of data over a single uart, i.e. you can have multiple virtual 
serial ports for:
   - AT commands
   - PPP
   - NMEA (GPS)


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