--- title: "Publish MQTT Message from arduino UNO / Mega with Ethernet Shield" url: "https://maker.wiznet.io/gemma/projects/Publish-MQTT-Message-from-arduino-UNO-Mega-with-Ethernet-Shield/" markdown_url: "https://maker.wiznet.io/gemma/projects/Publish-MQTT-Message-from-arduino-UNO-Mega-with-Ethernet-Shield/md" type: "UCC: User Created Content" author: "gemma" original_author: "gemma" original_url: "https://github.com/dnavarrom/aws_mosquitto_broker" published: "2022-02-23" language: "en" hardware: ["Arduino UNO", "Ethernet shield"] likes: 0 views: 357 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # Publish MQTT Message from arduino UNO / Mega with Ethernet Shield > Publish MQTT Message from arduino UNO / Mega with Ethernet Shield Original author: gemma (source: https://github.com/dnavarrom/aws_mosquitto_broker) ## Components - **Arduino UNO** x 1 ([docs](https://www.farnell.com/datasheets/1682209.pdf)) - **Ethernet shield** x 1 - Software: **Arduino IDE** ([docs](https://www.arduino.cc/en/software)) - Software: **AmazonWebServices AWS IoT** ([docs](https://aws.amazon.com/iot/)) ## Article ## ![](https://maker.wiznet.io/uploads/2022/02/mq-300x138.png) ## Step 1: Setup AWS Account Go to?[AWS](http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-set-up.html#cli-signup)?and setup the account Result: Acces Key + Access Secret ## Step 2: Install and Setup AWS CLI Install AWS CLI from?[here](http://docs.aws.amazon.com/cli/latest/userguide/installing.html) Then run AWS Configure and put your Region, your Access Key and Acces Secret ``` aws configure AWS Access Key ID [None]: AKIAIOSFODNN7EXAMPLE AWS Secret Access Key [None]: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY Default region name [None]: us-west-2 Default output format [None]: json ``` ## Step 3: Create an IAM policy for the bridge ``` aws iot create-policy --policy-name bridge --policy-document '{"Version": "2012-10-17","Statement": [{"Effect": "Allow","Action": "iot:*","Resource": "*"}]} ``` ## Step 4: Create Certificates Place yourself in ./config/certs directory and create certificates and keys, note the certificate ARN ``` cd ./config/certs sudo aws iot create-keys-and-certificate --set-as-active --certificate-pem-outfile cert.crt --private-key-outfile private.key --public-key-outfile public.key ?region eu-central-1 ``` List the certificate and copy the ARN in the form of arn:aws:iot:eu-central-1:0123456789:cert/xyzxyz ``` aws iot list-certificates ``` Attach the policy to your certificate ``` aws iot attach-principal-policy --policy-name bridge --principal REPLACE_ARN_CERT ``` Add read permissions to private key and client cert ``` sudo chmod 644 ./config/certs/private.key sudo chmod 644 ./config/certs/cert.crt ``` Download root CA certificate ``` sudo wget https://www.symantec.com/content/en/us/enterprise/verisign/roots/VeriSign-Class%203-Public-Primary-Certification-Authority-G5.pem -O rootCA.pem ``` ## Step 5: Edit mosquitto custom config file Rename awsbridge.conf.sample to awsbridge.conf ``` mv ./config/conf.d/awsbridge.conf.sample ./config/conf.d/awsbridge.conf ``` Edit ./config/conf.d/awsbridge.conf and follow the awsbridge.conf instructions ``` nano ./config/conf.d/awsbridge.conf ``` ## Step 6: Build Docker File ``` docker build -t aws_mqtt_broker . ``` ## Step 7: Run Docker Image ``` docker run -ti -p 1883:1883 -p 9001:9001 --name mqtt aws_mqtt_broker ``` Console / Log output: ``` 1493564060: mosquitto version 1.4.10 (build date 2016-10-26 14:35:35+0000) starting 1493564060: Config loaded from /mosquitto/config/mosquitto.conf. 1493564060: Opening ipv4 listen socket on port 1883. 1493564060: Opening ipv6 listen socket on port 1883. 1493564060: Bridge local.bridgeawsiot doing local SUBSCRIBE on topic localgateway_to_awsiot 1493564060: Bridge local.bridgeawsiot doing local SUBSCRIBE on topic both_directions 1493564060: Connecting bridge awsiot (a3uewmymwlcmar.iot.us-east-1.amazonaws.com:8883) 1493564060: Bridge bridgeawsiot sending CONNECT 1493564060: Received CONNACK on connection local.bridgeawsiot. 1493564060: Bridge local.bridgeawsiot sending SUBSCRIBE (Mid: 1, Topic: awsiot_to_localgateway, QoS: 1) 1493564060: Bridge local.bridgeawsiot sending UNSUBSCRIBE (Mid: 2, Topic: localgateway_to_awsiot) 1493564060: Bridge local.bridgeawsiot sending SUBSCRIBE (Mid: 3, Topic: both_directions, QoS: 1) 1493564060: Received SUBACK from local.bridgeawsiot 1493564061: Received UNSUBACK from local.bridgeawsiot 1493564061: Received SUBACK from local.bridgeawsiot ``` ## Step 8: Test ### Publish from aws iot console 1.- From AWS Management Console go to AWS IOT Services -> Test 2.- Subscribe to topics mentioned in our config file - awsiot_to_localgateway - localgateway_to_awsiot - both_directions 3.- Publish to awsiot_to_localgateway topic (hello world) 4.- Review log or console output in our local broker for something like this: `1493564128: Received PUBLISH from local.bridgeawsiot (d0, q0, r0, m0, 'awsiot_to_localgateway', ... (45 bytes))` ### Publish from host Flow: hostpc -> dockergateway -> aws `mosquitto_pub -h localhost -p 1883 -q 1 -d -t localgateway_to_awsiot -i clientid1 -m "{"key": "helloFromLocalGateway"}"` ### Publish from arduino UNO / Mega with Ethernet Shield [Arduino Client](https://github.com/dnavarrom/aws_mqtt_arduino_uno) ## References: [AWS Mosquitto Guide](https://aws.amazon.com/es/blogs/iot/how-to-bridge-mosquitto-mqtt-broker-to-aws-iot/) [Docker Mosquitto Image](https://github.com/toke/docker-mosquitto) --- Source: https://maker.wiznet.io/gemma/projects/Publish-MQTT-Message-from-arduino-UNO-Mega-with-Ethernet-Shield/