[Hilo] Why no respond for <AT+CPMS?> when in MUX?

Answer: When AT*PSSTKI is in mode 3, some actions will be performed automatically without user interaction and without sending URC to notify the user.
After some time, it will cause the internal state to be busy, and it may cause no response to <AT+CMPS?>

Please use < AT*PSSTKI=1> to avoid this issue.