Various links to LoRaWAN articles.

LoRa shield

Arduino LoRaWAN

Arduino LMIC

MCCI ADK

Guide

Arduino/libraries/MCCI_LoRaWAN_LMIC_library/project_config/lmic_project_config.h

#define LMIC_LORAWAN_SPEC_VERSION LMIC_LORAWAN_SPEC_VERSION_1_0_3
#define CFG_eu868               1
#define CFG_sx1276_radio        1
#define DISABLE_PING
#define DISABLE_BEACONS
#define LMIC_PRINTF_TO          Serial
#define LMIC_DEBUG_LEVEL        2

When testing against ChirpStack this hardly processes a JoinAccept in a timely fashion, but it will work eventually.

Ultimately you may consider using Arduino with LoRaWAN a waste of time.

Loriot UK Login

TTN Login

https://github.com/matthijskooijman/arduino-lmic

https://www.thethingsnetwork.org/forum/t/lmic-node-one-example-to-rule-them-all/46964

https://artifacts.chirpstack.io/downloads/chirpstack/

https://github.com/UniCT-ARSLab/LWN-Simulator