What is supposed to happen to the rmnet interface when the radio is turned off (i.e. issuing a
cm radio off on the command line)?
I’ve just tried that with a WP7702 running Legato 18.05.1 while I have an application with a TCP socket open. In my case, the network interfaces
bridge0 are both still up … and the
write() call in my application is still happily consuming data (although it’s not going up the stick!).
When the radio is turned off, I would have expected the
rmnet0 interface to have gone away, and my
write() call to start failing (probably with SIGPIPE or EPIPE errors).
cm data returns not connected and the log notes that the device is not registered to the network.
Why hasn’t the network gone away?