SIM 800L
The fucking nail to my coffin. This thing is so unreliable. I fixed on issue get the next one. Then get an error trying to make a http request, with little information on the web. Eventually switch to FTP which is working for a while. Then suddenly nothing is working properly. Even the serial communication has errors. This process took over 6 months. Constant debugging and headscraching involved. After hundreds of hours I give up. I'm going to switch to a Raspberry Pi Zero with an UMTS Stick attached. This is going to cost way more battery time but my project needs to be finished by july and I'm tired of this shitty little module.