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LoRaWan.sleep Problem

LoRaWAN® implementation Devices
#1

Hello,

I am having a problem with using lorawan.sleep. On reset entry I do some setup then call:
LoRaWAN.sleep(loraWanClass,debugLevel);
When I transition GPIO 13 from high to low the processor does not wakeup?
I assume its a problem with my setup or the sleep function. I traced into esp_lorawan.cpp and it looks like a call dealing with interrupts is called before the sleep function?
Any ideas on what I should try?
Using a Heltec Radio ESP32 V2 board and Arduino IDE.
Thanks.
JWS