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The MQTT protocol sits on top of a long-lived TCP/IP connection. There is next to no chance that a cellular modem would maintain a TCP/IP connection while in sleep mode. So you won't wake up from a subscription firing. It's not impossible that once you wake up for some other reason and reconnect, depending on the configuration of the MQTT broker, that you ...


This is probably not the answer you are looking for, but those 2 boards are not the same. There are many different versions of the SIM800c breakout boards, and that means you cannot say for sure whether pinouts are the same with these 2. This bit of the answer you may enjoy less, although it is good news in that you can figure it out for yourself! You can ...


Thanks for reopening the question. This is not something that you would encounter on a regular basis but I've faced this same question several times over the past 10 years. Especially when you place GSM equipment on a high site (mountain) where there are two or more, non-synchronised GSM cell's visible. This will result in incorrect cell hand-over and ...


I had the same problem. I solved it by setting the pulldown in the UART's pins' configuration.

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