Connect ditto with hono about ditto

[thjaeckle]

The Eclipse IoT Packages project provides a connection template showing a possible connection configuration to connect to Hono via Kafka:
https://github.com/eclipse/packages/blob/master/packages/cloud2edge/post-install/hono-kafka-connection.json

This should be a good starting point.
Apart from that there is plenty of documentation to explore.

[pavithvishnu]

hi @thjaeckle,
thanks for pointing me to the document, i have followed the document and deployed the c2e package on the AKS, and try out the examples mentioned in that, but i was unable to create a new connection between hono and ditto, i have try both amqp and kafka based connection setting, none of them works.
problem:

1. AMQP as mentioned in doc (dispatch-router container is not created i have follow the this link to install c2e https://www.eclipse.org/packages/packages/cloud2edge/installation/)
   curl -i -X POST -u devops:${DITTO_DEVOPS_PWD} -H 'Content-Type: application/json' --data '{
   "targetActorSelection": "/system/sharding/connection",
   "headers": {
   "aggregate": false
   },
   "piggybackCommand": {
   "type": "connectivity.commands:createConnection",
   "connection": {
   "id": "hono-connection-for-'"${HONO_TENANT}"'",
   "connectionType": "amqp-10",
   "connectionStatus": "open",
   "uri": "amqp://consumer%40HONO:verysecret@'"${RELEASE}"'-dispatch-router-ext:15672",
   "failoverEnabled": true,
   "sources": [
   {
   "addresses": [
   "telemetry/'"${HONO_TENANT}"'",
   "event/'"${HONO_TENANT}"'"
   ],
   "authorizationContext": [
   "pre-authenticated:hono-connection"
   ],
   "enforcement": {
   "input": "{{ header:device_id }}",
   "filters": [
   "{{ entity:id }}"
   ]
   },
   "headerMapping": {
   "hono-device-id": "{{ header:device_id }}",
   "content-type": "{{ header:content-type }}"
   },
   "replyTarget": {
   "enabled": true,
   "address": "{{ header:reply-to }}",
   "headerMapping": {
   "to": "command/'"${HONO_TENANT}"'/{{ header:hono-device-id }}",
   "subject": "{{ header:subject | fn:default(topic:action-subject) | fn:default(topic:criterion) }}-response",
   "correlation-id": "{{ header:correlation-id }}",
   "content-type": "{{ header:content-type | fn:default('"'"'application/vnd.eclipse.ditto+json'"'"') }}"
   },
   "expectedResponseTypes": [
   "response",
   "error"
   ]
   },
   "acknowledgementRequests": {
   "includes": [],
   "filter": "fn:filter(header:qos,'"'"'ne'"'"','"'"'0'"'"')"
   }
   },
   {
   "addresses": [
   "command_response/'"${HONO_TENANT}"'/replies"
   ],
   "authorizationContext": [
   "pre-authenticated:hono-connection"
   ],
   "headerMapping": {
   "content-type": "{{ header:content-type }}",
   "correlation-id": "{{ header:correlation-id }}",
   "status": "{{ header:status }}"
   },
   "replyTarget": {
   "enabled": false,
   "expectedResponseTypes": [
   "response",
   "error"
   ]
   }
   }
   ],
   "targets": [
   {
   "address": "command/'"${HONO_TENANT}"'",
   "authorizationContext": [
   "pre-authenticated:hono-connection"
   ],
   "topics": [
   "//things/live/commands",
   "//things/live/messages"
   ],
   "headerMapping": {
   "to": "command/'"${HONO_TENANT}"'/{{ thing:id }}",
   "subject": "{{ header:subject | fn:default(topic:action-subject) }}",
   "content-type": "{{ header:content-type | fn:default('"'"'application/vnd.eclipse.ditto+json'"'"') }}",
   "correlation-id": "{{ header:correlation-id }}",
   "reply-to": "{{ fn:default('"'"'command_response/'"${HONO_TENANT}"'/replies'"'"') | fn:filter(header:response-required,'"'"'ne'"'"','"'"'false'"'"') }}"
   }
   },
   {
   "address": "command/'"${HONO_TENANT}"'",
   "authorizationContext": [
   "pre-authenticated:hono-connection"
   ],
   "topics": [
   "//things/twin/events",
   "//things/live/events"
   ],
   "headerMapping": {
   "to": "command/'"${HONO_TENANT}"'/{{ thing:id }}",
   "subject": "{{ header:subject | fn:default(topic:action-subject) }}",
   "content-type": "{{ header:content-type | fn:default('"'"'application/vnd.eclipse.ditto+json'"'"') }}",
   "correlation-id": "{{ header:correlation-id }}"
   }
   }
   ]
   }
   }
   }' http://${DITTO_API_IP}:${DITTO_API_PORT_HTTP}/devops/piggyback/connectivity

2. Kafka based connection:
   i have trying deploying the ditto as docker container, also as helm package, also with c2e package. in all the cases, whenever i try to create a kafka connection using connectivity api and piggyback command. connectivity containers starts to crashs in loop. there is no recovery for it.

can you please help me out with it.?

[pavithvishnu]

There is an update, I have modified the yaml file. Now I have able to create a connection between hono and ditto using amqp.
but if I send the data from the device to hono it is not reflecting in ditto.

[thjaeckle]

Please provide the logs of Ditto's connectivity container. This should give an insight in the potential configuration errors.