Let's cover some steps to take if your Thing is not sending data as expected.
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Make sure sure your WiFi credentials are correct. Remember this is case sensitive! In most templates the WiFi credentials are stored in the WIFI_SSID[] and WIFI_PASSWORD[] variables.
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Check that the THINGNAME definition did not change from the configure step. This is used to identify the device on the Thingio servers.
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Confirm that your DEVICE_CERTIFICATE[] and PRIVATE_KEY[] did not change from the configure step. This is needed to authenticate with the servers.
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Check the serial output for any errors. Most templates should have logging when the WiFi connection is made and when the Thingio Cloud connection is made.
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