@tomstoffen I just briefly read your message. The first thing is TTN have their own fair use policy, so when sending a message every 5 seconds you will deplete your air time very soon. Depending on your payload size, you should be fine if you send a message every 15 minutes (that's what I've tested), maybe even every 5 minutes should be OK. from this page: https://www.thethingsnetwork.org/docs/lorawan/duty-cycle.html Finally, on The Things Network’s public community network, we have a Fair Access Policy that limits the uplink airtime to 30 seconds per day (24 hours) per node and the downlink messages to 10 messages per day (24 hours) per node. If you use a private network, these limits do not apply, but you still have to be compliant with the governmental and LoRaWAN limits.

@misterlisty I did not fully analyze Pycom's implementation of the Watchdog, As far as I understand, the event they trigger is an interrupt, not reset. Which means, that in a full this interrupt fails too. Using the RTC it is possible to set up an WDT which pulls reset on expiry, but that one seems not to be used.