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Write some Software

This project received 14 bids from talented freelancers with an average bid price of $238 USD.

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Project Budget
$30 - $250 USD
Total Bids
14
Project Description

I got a complete software made by a developer. There is a STM32 microcontroller and SIM900 with GPRS/GSM/email etc

For some reason, the inserted sim card establishes connection and rings normally when i call,

but when i send AT COM i do not get replies.

I need an expert someone to solve the problem.

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