Like the Readme it didn't work for my to compile. Here my changes (no guaranty!):
add "#define hal_init LMICHAL_init" to the lmic_project_config.h
(only if errors for you!) rename from in main.ino:
if (axp.isCharging()) {
baChStatus = "Charging";
to:
if (axp.isChargeing()) {
baChStatus = "Charging";
Like the Readme it didn't work for my to compile. Here my changes (no guaranty!):