Linker error with v2.0.x of Arduino core for the ESP32

[matthias-bs]

There is a naming conflict between MCCI_LoRaWAN_LMIC_library and Arduino core for the ESP32. The symbol hal_init is defined twice which causes a linker error. As a workaraound, v1.0.6 of the Arduino core for ESP32 must be used.

/home/runner/.arduino15/packages/esp32/tools/xtensa-esp32-elf-gcc/gcc8_4_0-esp-2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: /home/runner/.arduino15/packages/esp32/hardware/esp32/2.0.4/tools/sdk/esp32/lib/libpp.a(hal_mac.o): in function `hal_init':
(.text.hal_init+0xb4): multiple definition of `hal_init'; /tmp/arduino-sketch-3B10729107F9600CD77F61B8D0ED78E7/libraries/MCCI_LoRaWAN_LMIC_library/hal/hal.cpp.o:/home/runner/Arduino/libraries/MCCI_LoRaWAN_LMIC_library/src/hal/hal.cpp:416: first defined here
collect2: error: ld returned 1 exit status

Error during build: exit status 1

[matthias-bs]

This is a known issue:
mcci-catena/arduino-lmic#714

[matthias-bs]

See mcci-catena/arduino-lmic#714 (comment) for a fix.