I am trying to use the low-level TCP/IP SMS-over-IP functionality with my Konekt SIM. I can make normal HTTP requests and I have independently tested the TCP connection using ngrok, so I think the network connection itself is OK.
I am opening a TCP connection, sending the string “SXXXXYYYY+447999123456 Test SMS\n\n”, where:
XXXX is my four-character ID
YYYY is my four-character key
+44 is the UK country code
7999123456 is the destination mobile number with leading zero removed
Test SMS is the actual message
\n\n is two newlines as specified in the API documentation.
I’m not receiving anything on the destination mobile. Can anyone suggest what I’m doing wrong?