Captains (@bluejedi & @descartes & @arjanvanb ): Setting #define LMIC_ENABLE_arbitrary_clock_error 1 in the config file and LMIC_setClockError(MAX_CLOCK_ERROR * 10 / 100); in the arduino code, as recommended in a previous topic by @arjanvanb. I’ve used the latest 4.0.0 version.
Thanks guys! Maybe this can have something to do with the fact that I’m using the internal 8MHz oscillator of the ATMEGA1284p. Eventually the clock timing becomes an issue then. Can this be the problem or is this hypothesis nonsense?