Main source that this whole thing extends

https://github.com/eclipse/ditto-examples/tree/master/mqtt-bidirectional

(Depends on the docker deployment)

Getting started

• Start ditto via docker-compose up -d

• Create a policy

• Create a connection

• Create a thing

• Test with mosquitto_pub first, don't get crazy!

mosquitto_pub -h localhost -p 1883 -t arup-8-fitzroy-street/UDMIduino-000/events -m 'test'

With a sample payload like:

{"present_value":62}

e.g.

mosquitto_pub -h localhost -p 1883 -t arup-8-fitzroy-street/UDMIduino-000/events -m '{"present_value":62}' -d

• Create a payload mapping

  • there's a JS engine that DOESN'T SUPPORT FULL ES6 - BE WARNED
  • allegedly there's also a Java mapping method but, well, no
  • And then debug for a while
  • read this forever: https://www.eclipse.org/ditto/connectivity-mapping.html

• remove newlines in your JS with tr '\n' ' ' < payloadMapping.js > payloadMapping.txt

Gotchas

Auth for devops commands: devops:foobar

• eclipse-ditto/ditto#202

Monitor logs with docker compose like the following (-f = follow logs)

docker-compose logs -f connectivity

There are a lot of logs produced by ditto, delete them with:

sudo find /var/lib/docker/containers/ -type f -name "*.log" -delete

On mapping subdomains to ports with nginx

See: https://stackoverflow.com/questions/23649444/redirect-subdomain-to-port-nginx-flask

server {
    listen 80;
    server_name app.example.com;

    location / {
        proxy_pass http://localhost:8142;
    }   
}

On mapping subdomains to ports with Apache

Also see: https://stackoverflow.com/questions/23649444/redirect-subdomain-to-port-nginx-flask

cat /etc/apache2/sites-available/app.conf
<VirtualHost *:80>
    ServerName app.example.com
    ProxyPreserveHost On
    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>
    ProxyPass / http://localhost:8142/
    ProxyPassReverse / http://localhost:8142/
</VirtualHost>

Links

https://www.eclipse.org/ditto/2018-05-02-connecting-ditto-hono.html eclipse-ditto/ditto#202 https://stackoverflow.com/questions/56777282/connecting-eclipse-hono-and-ditto