Failing build: multiple definition of `hal_init' about lmic-node HOT 3 CLOSED

Hello,

I had the same issue using a TTGO LoRa32 v2.1 board

It seems to be related to the MCCI LoRaWAN LMIC Library https://github.com/mcci-catena/arduino-lmic and ESP32 based boards.
The same github issue exists on their github page: mcci-catena/arduino-lmic#714
They suggests adding #define hal_init LMICHAL_init to the lmic_project_config.h or if using PlatformIO to the command line.
mcci-catena/arduino-lmic#714 (comment)

So I got it working by adding -D hal_init=LMICHAL_init to the mcci_lmic build_flags in the platformio.ini file

from lmic-node.

You can solve this by using v3.5.0 of the espressif 32 platform. Although not a permanent fix, it will get you going. N.B. you will need to uninstall espressif 32 completely and then reinstall 3.5.0. HTH

from lmic-node.

Thanks! @CaptnAwsome and @JohnMacrae

I have added the workaround to LMIC-node and will therefore close this issue.

from lmic-node.