Value logging and graphs are not ideal to store on a respberrys sd-card. After a while, the card will crash because of to many writings, and all your historical data will be lost.
I did have a look at https://thingspeak.com. Really simple cloud service to create nice graphs. To store values, you simply make a web request.
https://api.thingspeak.com/update?api_k ... 0field2=50
I think the implementation could be pretty much like the MqttValueLogger. Just hook it up to a homeitem and a attribute, and it forwards data.
What do you think, would this be useful? I think there are similar services as thingspeak, have anyone tried it or any similar service? Which is best?
ThingSpeak
Re: ThingSpeak
I have used Adafruit.io https://learn.adafruit.com/mqtt-adafruit-io-and-you for some time and they do also have similar type of (free) services. If it is better or less, I do not know but the good part is that it is using MQTT. But it will require a login to be handled. As example, see this implementation I made for EventGhost http://eventghost.net/forum/viewtopic.p ... t=adafruit