P-P Lora units working, then not... (4 green bars on one, 0 green bars on other)

Wireless & IoT LoRa (Long Range)
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Hi, I’ve working with my two LoRaSerial units and making good progress on Arduino code to get them to control stoplights. Code is set as master/slave with master send ascii code to turn on Red/Yellow/Green light at receiver end. I’ve got SoftwareSerial operating on pns 2,3 so I can use USB for Arduino IDE. So far the units have been operating well for days in my lab and at short distance, at back of yard (30m) but suddenly comms have stopped and on receiver unit the 4 LEDs for RF strength are now off and comms is down. Transmit unit still has all 4 green LEDs on.

I plugged in USB and in TeraTerm, I found the unit was still in command mode AT. (Only change I had made previously was 9600bps, then ATW followed by ATO on both units.)

Entering ATR I see AirSpeed=0 and AutoTune=0 which are not per default settings. Checked other Tx unit (green LEDs on) and it’s the same, i..e. 0, 0 . SelectLedUse=4 on both units

but doc says 1. Has anyone else noticed settings loss/change or inconsistent with documentation? Any suggestions how to get Receiver unit operating again? I’ll try factory reset next, I guess. Thanks, Cheers, Peter

Lora Receiver settings_250826
Lora Receiver settings_2508261453×1615 345 KB

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I would try the mentioned reset and then fiddle with the AT commands some after to check if it actually returned to default

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Thanks, I did factory reset on both units and they did reconnect (all 4 green LEDs) but are still working intermittently. It does seem the units are losing sync and constantly resetting their comms link. Someone else pointed to this in their review comment about their application being RTK one way traffic and having to install different firmware to get their P-P to stay connected. i.e. that the LoRa’s need bi-directional comms to stay linked. More investigation needed.

Also, it just dawned on me that the RF from the antennas could be interfering with my Arduino. Just turned off LoRa (i.e. disconnected the short Serial conn) and now my Arduino code is running properly as it sequences my LED’s. I’ve ordered extension cables for the antennas to separate the LoRa RF from my Arduino and will report findings in a couple days.

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