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AT+CIPSEND > 130 bytes returns SEND FAIL but returns SEND OKAY when bytes less than 130 bytes - ESP8266 - Embedded Advice Forum
AT+CIPSEND not working after browser page connects to TCP server on ESP32. · Issue #120 · espressif/esp-at · GitHub
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Why does SIM respond to AT+CIPSEND with “+CME ERROR: operation not allowed” when the IP address and the TCP connection has been established? - SIM800L - Embedded Advice Forum
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Arduino UNO and ESP8266 module GET using AT command sometimes FAIL. - Home Automation - Arduino Forum
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