A Go client for Google IoT Core

Overview

IoT

A simple framework for implementing a Google IoT device.

This package makes use of the context package to handle request cancelation, timeouts, and deadlines.

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Copyright 2018, Andrew C. Young <[email protected]>

License: MIT

Here is an example showing how to use this library:

package main

import (
	"context"
	"log"
	"github.com/vaelen/iot"
	// Your client must include the paho package
	// to use the default Eclipse Paho MQTT client.
	_ "github.com/vaelen/iot/paho"
)

func main() {
	ctx := context.Background()

	id := &iot.ID{
		DeviceID:  "deviceName",
		Registry:  "my-registry",
		Location:  "asia-east1",
		ProjectID: "my-project",
	}

	credentials, err := iot.LoadRSACredentials("rsa_cert.pem", "rsa_private.pem")
	if err != nil {
		panic("Couldn't load credentials")
	}

	options := iot.DefaultOptions(id, credentials)
	options.DebugLogger = log.Println
	options.InfoLogger = log.Println
	options.ErrorLogger = log.Println
	options.ConfigHandler = func(thing iot.Thing, config []byte) {
		// Do something here to process the updated config and create an updated state string
		state := []byte("ok")
		thing.PublishState(ctx, state)
	}

	thing := iot.New(options)

	err = thing.Connect(ctx, "ssl://mqtt.googleapis.com:443")
	if err != nil {
		panic("Couldn't connect to server")
	}
	defer thing.Disconnect(ctx)

	// This publishes to /events
	thing.PublishEvent(ctx, []byte("Top level telemetry event"))
	// This publishes to /events/a
	thing.PublishEvent(ctx, []byte("Sub folder telemetry event"), "a")
	// This publishes to /events/a/b
	thing.PublishEvent(ctx, []byte("Sub folder telemetry event"), "a", "b")
}

Thanks to Infostellar for supporting my development of this project.

Issues
  • Couple of ideas for you

    Couple of ideas for you

    As I mentioned, this is really nice! I've written my own but I spent a lot of my time working around the password problem (I guess I should have forked the code, as you did); there are a lot of nice details in your code.

    Some ideas if you are interested:

    • I made the top-level client an interface, to facilitate mocking.
    • I have a utility function which sets mqtt.DEBUG, mqtt.WARN, ... etc so that if you need it you can get the underlying MQTT debug information.
    • I opted for now to expose the MQTT token to callers, because I wasn't sure if a fixed timeout would be the right thing. Dunno if that's really a good idea or not. I guess I could wrap the token to make it less ugly.

    Anyway, well done.

    opened by danielbprice 6
Releases(v1.0)
Owner
Andrew Young
I'm a software engineer and manager who dabbles in all sorts of random languages. I am currently a Software Engineering Manager at Indeed in Tokyo, Japan.
Andrew Young
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