Google Cloud IOT- Device Configuration via Firebase/cloud functions?

_x000D_ _x000D_ I have been able to successfully receive state and telemetry from my iot device using mqtt->pubsub->firebase functions->FCM to an android app. My iot device is also registered to receive the config callback, and it successfully receives the current config mqtt message when the device connects. Now, I would like to be able to use my android app to initiate a config message to send a run/stop command. I had thought I could accomplish this via an android api call or from within a cloud function. There don't seem to be any examples on the web for this. This example appears to be intended to run on a 3rd party node.js server rather than from inside a cloud function or an android app: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/iot/manager/manager.js#L865 From within the cloud function it was very easy to use admin.firestore() and admin.messaging() to call functions and accomplish what I needed. However the IOT API's don't appear to work the same way. I'm clearly missing something. So in short- How can I initiate an IOT config message from android or a cloud function? It would be great if I could access the other registry management functions as well. Thanks in advance for any help.