LTE Module Series
EC2x&EG9x&EM05 SMTP AT Commands Manual
EC2x&EG9x&EM05_SMTP_AT_Commands_Manual 24 / 31
4 Error Handling
4.1. Executing SMTP AT Command Fails
When executing SMTP AT commands, if response “ERROR” is received from the module, please check
whether the (U)SIM card is inserted, and whether it is “+CPIN: READY” returned when executing
AT+CPIN?.
4.2. PDP Activation Fails
If it is failed to activate a PDP context by AT+QIACT command, please check the following configurations:
1. Query whether the PS domain is attached or not by AT+CGATT? command. If not, please execute
AT+CGATT=1 to attach PS domain.
2. Query the PS domain status by AT+CGREG? command and make sure the PS domain has been
registered.
3. Query the PDP context parameters by AT+QICSGP command and make sure the APN of specified
PDP context has been set.
4. Make sure the specified PDP context ID is neither used by PPP nor activated by AT+CGACT
command.
5. According to 3GPP specifications, the module only supports three PDP contexts activated
simultaneously, so customers must make sure the number of activated PDP contexts is less than 3.
If all above configurations are correct, but activating the PDP context by AT+QIACT command still fails,
please reboot the module to resolve this issue. After rebooting the module, please check the
configurations mentioned above for at least three times and each time at an interval of 10 minutes to
avoid frequently rebooting the module.
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