I am succeeding in sending an update string via a SIM800L to ThingSpeak but the channel is not updating the channel. I know the string is correct since it is provided by the site that I am posting to.
I have read on this site that the string length needs to be defined to be 4 more than the character count. Does this always work?
Where would one find instructions regarding correct use the AT-CIPSEND command with SIM Tech devices?
I using an Arduino Pro Mini and interfacing with the modem using a Software Serial connection.