LMiC on Adafruit Lora Feather successfully sends message to TTN and then halts with "Packet queued"

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Yes !!! Success

I have the ABP demo working using the following pinmap.

// Pin mapping
const lmic_pinmap lmic_pins = {
    .nss = 8,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = LMIC_UNUSED_PIN,
    .dio = {3, 6, LMIC_UNUSED_PIN},
};

The SPI frequency is set to 8Mhz in the hal.cpp (will try default 10Mh value later).

The only extra connection I needed was to connect DIO1 to pin D6.

I will try the OTAA example later on.