Hello Telit Team,
I’m facing TCP connection issues with LE910C1-WWX module (FW: M0F.103007).
Module Details:
- IMEI: 350936966228950
- SIM: Jio 4G India
- Firmware: 25.30.108-P0F.105701
Issue: TCP connection fails with “NO CARRIER” immediately after AT#SD command succeeds. Please see below image steps followed.
Steps I followed:
1. AT+CFUN=1,1
2. AT+CREG=1 / AT+CGREG=1
3. Network: Registered to Jio 4G (confirmed with AT+COPS?)
4. AT+CGATT=1 (OK)
5. AT+CGDCONT=1,“IP”,“jionet” (OK)
6. AT#SGACT=1,1 (Success - got IP: 10.116.74.149)
7. AT#SCFG=1,1,300,90,600,50 (OK)
8. AT#SCFGEXT=1,0,0,240,0,0 (OK)
9. AT#SD=1,0,4242,“tcpbin.com”,0,0,1 (OK then NO CARRIER)
What works:
- PDP activation successful (gets IP address)
- Network registration OK
- Socket configuration accepted
What fails:
- TCP connection establishment
- After AT#SD returns OK, immediately get NO CARRIER
- Cannot send data (AT#SSEND returns ERROR: wrong state)
Request:
1. Why does AT#SD return OK then NO CARRIER?
2. Is port 4242 blocked by Telit firmware?
3. Correct AT command sequence for TCP on Jio network?
4. Any known issues with LE910C1-WWX on Jio 4G?
Regards,
Venkata Kishore P