hi @westmaxx, Let's first connect the 2 Lopy4 in the same Mesh network. What firmware are you using? what micropy scripts are you using? Could you run this tutorial: https://docs.pycom.io/tutorials/lora/lora-mesh/ ? The LoRa 868 Mhz antenna is on the right side of the LED, as shown here: https://docs.pycom.io/gitbook/assets/lopy4-pinout.pdf Also, please make sure you're using the same LoRa parameters on both boards? Band, frequency, bandwidth and spreading factor?

Dear @Roqueton, we have tried to implement SIM800 PPPoS support (WIP), see also [1,2,3]. With kind regards, Andreas. [1] https://github.com/pycom/pycom-micropython-sigfox/pull/408 [2] https://community.hiveeyes.org/t/ppp-over-serial-pppos-support-for-micropython-on-esp32/2994 [3] https://community.hiveeyes.org/t/unlocking-and-improving-the-pythings-sim800-gprs-module-for-micropython/2978/29