[Electron] Modem serial pausing before going into sleep with SLEEP_NETWORK_STANDBY #1160
With introduction of proper flow control handling via RTS line in PR #1140, modem should be unconditionally paused (by deasserting RTS line) before going into sleep with
This PR includes a cucumber-based acceptance test which demonstrates how a sleepy Electron can receive a publish posted while it was sleeping:
Includes PR #1097
Since this does change the current behavior, we should add some Docs that explain what happens with received data now when the modem remains powered up while the system sleeps. The system has the ability to receive a message that was buffered by the modem during STM32 sleep. If too much data is received (how much?), what happens? (excessive data is lost or does it overwrite in circular fashion?).