core-command subscribes to 3rd-party command requests and publishes to the appropriate device service via messaging

Signed-off-by: Chris Hung chris@iotechsys.com

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

1. Run core-command from this branch with external MQTT broker and MESSAGEQUEUE_REQUIRED=true environment variable
2. Run PSUBSCRIBE edgex.command.request.* in redis container to subscribe to the forwarded request
3. send command request to edgex/command/request/<device>/<command>/<method> topic. For example send following message to edgex/command/request/Random-Boolean-Device/Bool/get`:

{
  "CorrelationID": "14a42ea6-c394-41c3-8bcd-a29b9f5e6835",
  "ApiVersion": "v2",
  "RequestId": "e6e8a2f4-eb14-4649-9e2b-175247911369",
  "ContentType": "application/json",
  "QueryParams": {
    "ds-pushevent":"yes",
    "ds-returnevent":"yes"
  }
}

4. check the message is received by redis container:

/data # redis-cli
127.0.0.1:6379> PSUBSCRIBE edgex.command.request.*
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"
2) "edgex.command.request.*"
3) (integer) 1
1) "pmessage"
2) "edgex.command.request.*"
3) "edgex.command.request.device-virtual.Random-Boolean-Device.Bool.get"
4) "{\"ReceivedTopic\":\"\",\"CorrelationID\":\"14a42ea6-c394-41c3-8bcd-a29b9f5e6835\",\"ApiVersion\":\"v2\",\"RequestID\":\"e6e8a2f4-eb14-4649-9e2b-175247911369\",\"ErrorCode\":0,\"Payload\":null,\"ContentType\":\"application/json\",\"QueryParams\":{\"ds-pushevent\":\"yes\",\"ds-returnevent\":\"yes\"}}"

New Dependency Instructions (If applicable)