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replaced http://arduino.stackexchange.com/ with https://arduino.stackexchange.com/

edited Apr 13, 2017 at 12:50

This looks like you are constructing the data to be sent as GET parameters (i.e as part of the querystring), whereas I believe dweet.io expects them as part of the POST body - as seen here.

There seem to be many people struggling to successfully send HTTP POSTs with a SIM900, but I think this answer outlines the correct sequence to make it work.

answered Jul 27, 2016 at 12:13

KennetRunner