@reidfo Sure looks like it. Change line 294, see if you get a different behavior. http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc385349238 https://github.com/pycom/pycom-micropython-sigfox/blob/f517b1df5083ddc158c075852d7f2497480b0d84/esp32/frozen/Common/MQTTClient.py#L294

@jcaron said in How can I set the bandwidth of the Lopy4 to 7.8 kHz to achieve the RF sensititvity of -148 dBm?: @bmarkus In Europe, one of the sub-bands allows 10% duty cycle. Also, IIRC if you do LBT-AFA (listen before talk, frequency agility), there's no duty-cycle limit (maybe not on all bands, too lazy to check). You are right, and also allowed RF power may vary on subbands. Still bitrate is very low.