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I'm using an SIMCOM, SIM800. This module was working perfectly fine, but suddenly it stopped posting and while debugging I found out that AT+CSQ was returning "+CME ERROR:604" which according to Telit means can not allocate control socket

What does that mean? What does the control socket do? It's strange to see the CSQ command fail. Design question Has my power block somehow damaged the module?

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The SIM800 module was non-functional. Once I changed all the AT commands worked perfectly fine. Thanks for the views. :)

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