Hello,
I am sending data to a website with Arduino + SIM800L in json format. On the web a php program decodes json and writes the data in a file. (I use a SIM from Things Mobile)
Everything works fine, but I get an error: AT + HTTPINIT -> ERROR
I do not know how important that is, because despite this, the data goes well to the web.
Why can that error be? How can I solve?