SimCom SIM7800 Series User Manual

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SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual 7 / 41
/*Configure the negotiate timeout value of the
specified SSL context*/
AT+CSSLCFG="negotiatetime",<ssl_ctx
_index>,<negotiatetime>
a)If successfully:
OK
b)If failed:
ERROR
Write Command
/*
Configure the server root CA of the
specified SSL context*/
AT+CSSLCFG="cacert",<ssl_ctx_index>
,<ca_file>
Response
a)If successfully:
OK
b)If failed:
ERROR
Write Command
/*
Configure the client certificate of the
specified SSL context*/
AT+CSSLCFG="clientcert",<ssl_ctx_ind
ex>,<clientcert_file>
Response
a)If successfully:
OK
b)If failed:
ERROR
Write Command
/*
Configure the client key of the specified
SSL context*/
AT+CSSLCFG="clientkey",<ssl_ctx_ind
ex>,<clientkey_file>
Response
a)If successfully:
OK
b)If failed:
ERROR
Defined Values
<ssl_ctx_index>
The SSL context ID. The range is 0-9.
<sslversion>
The SSL version, the default value is 4.
0 – SSL3.0
1 – TLS1.0
2 – TLS1.1
3 – TLS1.2
4 – All
The configured version should be support by server. So you
should use the default value if you can’t confirm the version
which the server supported.
<authmode>
The authentication mode, the default value is 0.
0 – no authentication.
1 –server authentication. It needs the root CA of the server.
2 –server and client authentication. It needs the root CA of the
server, the cert and key of the client.
3–client authentication and no server authentication. It needs the
cert and key of the client.
<ignoreltime>
The flag to indicate how to deal with expired certificate, the
default value is 1.
0 – care about time check for certification.
1 – ignore time check for certification

SimCom SIM7800 Series Specifications

General

Brand	SimCom
Model	SIM7800 Series
Category	Control Unit
Language	English

Summary

Introduction to MQTT AT Commands

1.1 SSL Context Management for SSL/TLS MQTT

Explains AT commands for managing SSL context for MQTT.

1.2 Process of Using MQTT AT Commands

Outlines the steps for using MQTT AT commands in sequence.

MQTT AT Command Reference

2.1 SSL Context Management AT Commands

Details AT commands for configuring SSL contexts for secure MQTT connections.

2.2 MQTT Services AT Commands

Covers AT commands for starting, stopping, and managing MQTT client services.

2.3 Command Result and Unsolicited Codes

Lists all command result codes and unsolicited codes for MQTT operations.

MQTT Usage Examples

3.1 Access MQTT Server (Not SSL/TLS)

Demonstrates connecting to an MQTT server without SSL/TLS.

3.2 Connect to SSL/TLS MQTT Server (No Server Verification)

Shows connecting to SSL/TLS MQTT server without verifying the server.

3.3 Access SSL/TLS MQTT Server (Verify Server Only)

Details accessing SSL/TLS MQTT server with server verification.

3.4 Access SSL/TLS MQTT Server (Verify Server and Client)

Illustrates connecting to SSL/TLS MQTT server with both server and client verification.

3.5 Access MQTT Server without UTF8 Coding Check

Explains communication with MQTT server without UTF8 coding check.