Lost downlink when using LowPower.deepSleep()

[remuslazar]

This issue was also covered in depth here arduino-libraries/MKRWAN#36 and this problem still persists using the MKRWAN_v2 Library and 1.3.1 fw.

I want to bring this up again. Because of this issue it is currently not possible to use the e.g. Arduino MKRWAN 1310 device in a more realistic, battery powered scenario. The documentation also claims

(..)
power consumption is now as low as 104uA!

and also the use of the ArduinoLowPower library.

[remuslazar]

Because of the quite slow serial speed (9600 bps) another alternative could also be waking up the SIMD21 on SERCOM traffic. This issue was also covered here arduino-libraries/ArduinoLowPower#20 and IMO this could be the better approach to solve this problem indirectly, not having to fiddle with the Murata firmware.