I tried to send a GET request using TCP over a SIM868 modem , but I always received "ERROR" after the AT command: AT+CIPSEND. (the modem works ok and I was able to send and receive SMS, HTTP request, phone calls , etc.)
I use minicom on my raspberry 3, with the following commands:
AT+CSTT="APN NAME" (I wrote here my APN) OK AT+CIICR OK AT+CIFSR 100.73.110.9 AT+CIPSTART="TCP","exploreembedded.com",80 OK CONNECT OK AT+CIPSEND > GET exploreembedded.com/wiki/images/1/15/Hello.txt HTTP/1.0 SEND OK
After the I received the SEND OK , I never received the page content. Also according the AT Commands manual after you type the GET you must type CTRL+Z, what I did it. I tried the url in the browser and it works OK. Help will be vey appreciated!