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the GSM code i have been working out is up and running, I use JSON format in sending the data obtained by my sensors, but the JSON message I have been receiving contains parenthesis instead of curly braces.

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One or both of your GSM endpoints is incapable of handling ESC prefixes according to GSM 03.38. The only difference between "{" and "}" and "(" and ")" is that the former are signified by a preceding ESC which either is not being generated by the sender or is not being interpreted by the receiver.

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