Hi,
I am using Thingy 91 in Australia, and I have linked Asset Tracker v2 with overlay-lwm2m.conf to communicate with my own LwM2M server, which is running an instance of Leshan server. Thingy 91 has no problem communicating with my server in both passive and active mode, as long as the cellular link is stable. I took it for a drive, but when I got home, I realised it had stopped sending data to my server as soon as I had entered my underground parking, even though the LED would dutifully blink green and teal every two minutes, just like you'd expect it to behave in active mode. When I connected to it via LTE Monitor I realised the LTE link is disconnected and Thingy 91 cannot reconnect. Recycling the power easily resolved the problem, so I decided to simulate LoS by wrapping it in aluminium foil. Once again, connection was lost and could not be established until either the power was recycled, or I'd issue AT+CFUNC=0 followed by AT+CFUN=1 via LTE Monitor.
My question is, what is the expected behaviour of the modem in case of LoS? Does it not try to reconnect by itself? Does the software have to monitor link connection and recycle the power on the modem if it is unable to establish a link?
I am using nRF Connect SDK v2.0.0, with modem firmware 1.3.2.
Steps tp reproduce:
- Compile Asset Tracker v2 with overlay-lwm2m.conf (modified to connect to your own LwM2M server).
- Change /50009/0/0 (Passive Mode RID) to false via the server as soon as Thingy 91 registers with it.
- Wait a few minutes and see data coming in.
- Wrap Thingy 91 in aluminium foil for at least 5 minutes to make sure it experiences LoS for at least one ping.
- Unwrap Thingy 91, plug it into LTE monitor, and monitor modem status
Kind Regards,
Iman
