I am working with a team to send data from Raspberry Pi over 2G network to a server using a GSM module called “SIM800L EBV”. We encountered an AT+CIPSEND error that has only occurred in Zambia, Africa while having been working correctly in the US (Arkansas, Colorado, and Washington state) for two ye…

Why does SIM respond to AT+CIPSEND with “+CME ERROR: operation not allowed” when

ECE194 December 7, 2018, 9:18pm 2

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