Commits on Nov 27, 2022

1. Add support for newer SIMCom devices …

   This patch adds support to event driven calls for newer SIMCom devices
   such as the SIM7100, SIM7500, and SIM7600.
   
   These devices support the command "AT+CLCC=1" which sets the modem to
   print the CLCC output on every call status change. I made an effort to
   to probe modem upport for automatic reporting by trying setting AT+CLCC
   to 1. The untested assumption is that the command will fail if the modem
   does not support it.
   
   The regular expressions used for _handleCallAnswered,
   _handleCallInitiated, and _handleCallEnded are simply a copy and paste
   from the regular expression used for CLCC, replacing what was on the
   third group by a fixed number representing the call status. For example,
   using the number 6 to indicate that the call was disconnected.
   
   To detect the newer devices I used the availability of the +SIMCOMATI
   command but I am not really sure how reliable this is. My concern is of
   false positives for devices that could support the +SIMCOMATI and not
   support the automatic reporting of "AT+CLCC=1".
   
   This was tested on an SIM7600G.
   
   Signed-off-by: Peter Senna Tschudin <[email protected]>

   

   petersenna committed Nov 27, 2022
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