I am currently working on a project for which I want to receive SMS messages using a key. The key used is the Huawei E3131 Hi-Link key, which is configured in serial mode via USB mode. Communication with the key is via AT commands. The problem is that SMS messages are not accepted. After many attempts to fix this, I found that SMS messages were received after sending the SMS message to the key itself. I also tested another key (Huawei E173), but it works great.
For testing purposes, I am not using code yet. I manually execute the following AT commands to initialize the key:
- The pin is ready according to "AT + CPIN?".
- Dongle is set to text mode through "AT + CMGF = 1".
- SIM storage is used via "AT + CPMS =" SM "," SM "," SM ".
- Message indicators (AT + CNMI) are set to "1.2", but "0.0,0,0,0" and other combinations have also been checked.
After executing these commands, I check the received SMS messages through "AT + CMGL", and none of them are displayed (as expected). Then I will send an SMS to the key. Wait a while until the messages appear (although you were expecting them). Then I will use the key to send SMS to another device using the AT + "CMGS" command. This SMS message was received correctly on another device. After sending this SMS message, the SMS message sent to the key appears through "AT + CMGL".
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