AT+CIPSEND not working after browser page connects to TCP server on ESP32. · Issue #120 · espressif/esp-at · GitHub
SOLVED] How to POST data to ubidots, I'm using ESP8266 and ARDUINO UNO - IoT Devices - Ubidots Community
![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 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](http://www.embeddedadvice.com/uploads/default/original/1X/58f436d35610e5c1eed25c37e16b93945a8671eb.png)
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
![Forums / Embedded GSM Development / Command set for SIM300 to send data to tcp server via gprs - Rickey's World of Microcontrollers & Microprocessors Forums / Embedded GSM Development / Command set for SIM300 to send data to tcp server via gprs - Rickey's World of Microcontrollers & Microprocessors](https://www.8051projects.net/files/public/1253882650_22457_FT18327_hyper_error_.jpg)
Forums / Embedded GSM Development / Command set for SIM300 to send data to tcp server via gprs - Rickey's World of Microcontrollers & Microprocessors
![AT+CIPSEND > 130 bytes returns SEND FAIL but returns SEND OKAY when bytes less than 130 bytes - ESP8266 - Embedded Advice Forum AT+CIPSEND > 130 bytes returns SEND FAIL but returns SEND OKAY when bytes less than 130 bytes - ESP8266 - Embedded Advice Forum](http://www.embeddedadvice.com/uploads/default/original/1X/3c1874560bbfcda2adaa8e597a7aa909b9a29eab.png)