Fix Pygate LoRa rx lock-up after LoRa tx

[pauldeng]

Hi Pycom team,

This issue was discussed at https://forum.pycom.io/topic/7042/pygate-does-not-receive-after-downlink?_=1624679301959.

The Issue
I experienced a Pygate firmware issue that Pygate will not receive LoRa message after a downlink message is sent. This issue is not related to LTE-M, but on LoRa gateway side. Power cycle the Pygate will fix this problem.

The Fix
I spent quite bit of time to try to fix.
I am not quite understand that part of the code, but I managed to fix it. Basically, disable gateway reset/restart after tx.
Now, the Pygate continues to rx after tx. There is no more lock up. I will continue testing the long term, but so far so good.

My Hardware

• PyGate 915
• GPY
• LTE-M1 network with public ipv4 address
• chirpstack-gateway-bridge 3.11.0 at AWS to receive udp from Pygate

My Compile Environment

• Ubuntu 20.04 VM
• https://github.com/pycom/pycom-micropython-sigfox v1.20.2.r4 code base Dev branch a37510c

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