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SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual 4 / 41

This document is a reference guide to all the AT commands defined for MQTT. Through these MQTT AT

commands, you can communicate with a MQTT server.

1 Introduction

1.1 The SSL Context Management AT Commands (for SSL/TLS MQTT)

Step 1: Configure SSL version by AT+CSSLCFG=“sslversion”,<ssl_ctx_index>,<sslversion>.

Step 2: Configure SSL authentication mode by AT+CSSLCFG=“authmode”,<ssl_ctx_index>, <authmode>.

Step 3: Configure the flag of ignore local time by

AT+CSSLCFG=“ignorlocaltime”,<ssl_ctx_index>,<ignoreltime>.

Step 4: Configure the max time in SSL negotiation stage by

AT+CSSLCFG=“negotiatetime”,<ssl_ctx_index>,<negotiatetime>.

Step 5: Configure the server root CA by AT+CSSLCFG=“cacert”,<ssl_ctx_index>,<ca_file>.

Step 6: Configure the client certificate by AT+CSSLCFG=“clientcert”,<ssl_ctx_index>,<clientcert_file>.

Step 7: Configure the client key by AT+CSSLCFG=“clientkey”,<ssl_ctx_index>,<clientkey_file>.

Step 8: Download the certificate into the module by AT+CCERTDOWN.

Step 9: Delete the certificate from the module by AT+CCERTDELE.

Step 10: List the certificates by AT+CCERTLIST.

1.2 The process of Using MQTT AT Commands

Step 1: Ensure GPRS network is available before performing SSL related operations.

Step 2: Configure the parameter of PDP context by AT+CGDCONT.

Step 3: Activate the PDP context to start MQTT service by AT+CMQTTSTART.

Step 4: Acquire a client by AT+CMQTTACCQ.

Step 5: Configure SSL context by AT+CSSLCFG (if connect to SSL/TLS MQTT server).

Step 6: Set the SSL context used in SSL connection by AT+CMQTTSSLCFG (if connect to SSL/TLS MQTT

server).

Step 7: Connect to MQTT server by AT+CMQTTCONNECT.

Step 8: Subscribe to message by AT+CMQTTSUB.

SimCom SIM7500 Series Command Manual

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