I have been experimenting extensively with the NovaM (SARA R410). I am connecting it to a single-board-computer (similar to a Raspberry Pi). My software system launches the ppp daemon passing it a chat-script (to configure and establish a connection). After the connection is established I see a new interface ppp0 and my system has Internet access.
My system will gain Internet access in this way many times but eventually (under circumstances I have not been able to identify) my chat-script will fail to establish a connection. I have enabled ppp logging and I can watch the connection progress in real time. Here are the AT commands in the chat-script:
where is the correct APN. When all goes well, the Nova returns a series of “OK” responses and returns “CONNECT” after the last command.
However, the trouble I run into is that the command,
+CME ERROR: operation not supported
Once this error occurs, always in response to the AT+CGDCONT command, it will just keep recurring.
The only way I have found to “solve” the problem is to cycle the power on the Nova (or issue “AT+CFUN=15”).
This seems quite odd since the command is always being read from the same file (no chance of a typo), yet “sometimes” the command is supported (no error) and other times it is not.
Any help or thoughts on this will be much appreciated.