How To Use Mqtt Tls With Esp8266
Preparing Axio Builder and ESP8266(Wi-Fi).
- ESP-01(ESP8266) connect as below.
Preparing the mosquitto server.
- Download mosquitto and compile.
- Edit mosquitto.conf
port 8883 cafile /home/USER/MQTT/mosquitto/certs/mqtt_ca.crt certfile /home/USER/MQTT/mosquitto/certs/mqtt_srv.crt keyfile /home/USER/MQTT/mosquitto/certs/mqtt_srv.key tls_version tlsv1 - copy certs file from sp-axio github.
- Run the ‘mosquitto -c mosquitto.conf -v’.
- ‘mosquitto’ print message as below.
1513907710: mosquitto version 1.4.9 (build date 2017-12-19 16:42:27+0900) starting 1513907710: Config loaded from mosquitto.conf. 1513907710: Opening ipv4 listen socket on port 8883. 1513907710: Opening ipv6 listen socket on port 8883.
Preparing the mosquitto pub/sub.
- Download ESP8266_for_Axio, Mbedtls_ESP8266_for_Axio and ArduinoMqtt_for_Axio as zip file.
- In the arduino IDE, use the following procedure to add downloaded zip file.
- menu > Sketch > Include Library > Add .zip Library… > select ‘ESP8266_for_Axio.zip’ and click ‘OK’ button.
- Do the same thing for the ‘Mbedtls_ESP8266_for_Axio.zip’ and ‘ArduinoMqtt_for_Axio-master.zip’.
- Open Mbedtls example as following procedure.
- menu > File > Examples > ArduinoMqtt_for_Axio > Examples > ConnectTLSEsp8266WiFiClient
Run the mbedtls client.
- Modify the following values in the example code to suit your development environment.
- ssid and password of your router to mySSID/myPSK.
- IP Address of your mosquitto server to destServer.
- If you want to test the pub and sub of mqtt with one client.
MQTT_TOPIC_SUB = “test/” MQTT_ID “/sub” to MQTT_TOPIC_SUB = “test/” MQTT_ID “/pub”
- Verify/Compile and Upload to Axio-Builder.
- Open ‘Serial Monitor’ and check the result.
Connecting success to establish the SSL connection MQTT - Connect, clean-session: 1, ts: 13202 MQTT - Wait for message, type: 2, tm: 8757 ms MQTT - recv Bytes:1/want:1/data:20 MQTT - recv Bytes:1/want:1/data:2 MQTT - read:2, result:2 MQTT - recv Bytes:2/want:2/data:0 MQTT - Process message, type: 2 MQTT - Keepalive interval: 12 sec MQTT - Session is not present => reset subscription MQTT - Subscribe, to: test/TEST-ID/pub, qos: 0 MQTT - Wait for message, type: 9, tm: 8553 ms MQTT - recv Bytes:1/want:1/data:90 MQTT - recv Bytes:1/want:1/data:3 MQTT - read:3, result:3 MQTT - recv Bytes:3/want:3/data:0 MQTT - Process message, type: 9 MQTT - Subscribe ack received MQTT - Publish, to: test/TEST-ID/pub, size: 13 MQTT - Yield for 30000 ms MQTT - recv Bytes:1/want:1/data:30 MQTT - recv Bytes:1/want:1/data:1F MQTT - read:1F, result:31 MQTT - recv Bytes:31/want:31/data:0 MQTT - Process message, type: 3 MQTT - Publish received, qos: 0 MQTT - Deliver message for: test/TEST-ID/pub Message arrived: qos 0, retained 0, dup 0, packetid 9512, payload:[Hello World!]- ConnectEsp8266WiFiClient example publishes message ‘Hello World!’ to test/TEST-ID/pub topic.