@dk_iot MySensors is not BLE based. It uses a different proprietary rf mode. nagelc mentioned the previous nrf5 arduino core by sandeep, compatible with MySensors. But the new released arduino core you're talking, is based on mbed, it's not MySensors compatible (would need some work, afaik there is no plan for the moment).

@ArduiSens actually it should be working with all gateway types

Just a thought, but could this be done using rs485/rs232 as network transport? If it does work like a null modem, then it could be worth a shot. /Thomas