How to receive SMS message in standby mode in nRF9160?

Question

I want to wake up nRF9160 by SMS. 
 What I want to do: 
 The nRF9160 usually sleeps to reduce power consumption, and only when it receives SMS it wakes up and send some data by UDP or so. 
 
 I succeeded in implementing MQTT(+TLS), but have no experience to implement SMS function. 
 Any advice?

Yusuke · Accepted Answer

I solved this issue! 
 You must need to use the same file descriptor when running "AT+CNMI=3,2,0,1", "AT+CNMI?" and "AT+CNMA". Get a fd by this line and, and send the above commands with this. 
 int at_socket_fd = socket(AF_LTE, 0, NPROTO_AT);

How to receive SMS message in standby mode in nRF9160?

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