[Serrawireless] HL8710 Commands sequence to connect to AWS IoT Core(MQTT)

Here are instructions on how to use the TCP/UDP Commands in the AT Commands guide, but there are no examples of the MQTT Command set.
So I searched for some posts in the Sierra wireless forum and finally found the commands set for that.

Some notes about SSL and authentication before connecting.

1. Store SSL Certifications issued from the AWS IoT Core via the +KCERTSTORE command and +KPRIVKSTORE command.
2. The "auth" parameter of the +KSSLCRYPTO command to set Cipher Suite Configuration should be 3 as Mutual authentication for authenticating to AWS IoT Core.

AT+KSSLCRYPTO=0,8,1,8192,4,4,3,0

 

Then you can connect to AWS IoT Core with HL7810 MQTT commands.

# Store Root CA
AT+KCERTSTORE=0,nbytes,0
...

# Store Local CA
AT+KCERTSTORE=1,nbytes,0
...

# Store Private Key
AT+KPRIVKSTORE=0,nbytes
...

# GPRS Connection Configuration
AT+KCNXCFG=1,"GPRS",""
...

# Cipher Suit Configuration for AWS IoT Core
AT+KSSLCRYPTO=0,8,1,8192,4,4,3,0

# Configure server and MQTT messaging protocol parameters
AT+KMQTTCFG=1,1,"endpoint....iot.ap-northeast-2.amazonaws.com",8883,4,"ClientID",120
...

# Connect to the AWS IoT MQTT Broker
AT+KMQTTCNX=1
...

+KMQTT_IND: 1,1 # Successful

# Publish message
AT+KMQTTPUB=1,"topic..",0,0,"Payload! maximum size is 80 bytes."
...

# Close the session 1
AT+KMQTTCLOSE=1
...

# Delete session 1
AT+KMQTTDEL=1
...

 

The MQTT Commands are supported for HL781X/45 modules only.
If you use other HL78XX series like HL7800, you can use the MQTT protocol using the TCP commands.

Here is an example of using MQTT with HL Shield and ST Nucleo board.

https://source.sierrawireless.com/airvantage/avc/howto/hardware/samples/hl-stnucleo-mqtt-c/

Using MQTT with an HL Shield and a ST Nucleo - avc - Sierra Wireless

 

https://docs.aws.amazon.com/iot/latest/developerguide/transport-security.html

Transport security in AWS IoT Core - AWS IoT Core

 

https://source.sierrawireless.com/resources/airprime/software/hl78xx_at_commands_interface_guide/#sthash.flqdHsxp.x2CBtrIY.dpbs

 

 

 

* Photo by Jorge Ramirez on Unsplash