I forked unofficial-nest-api and added support for 'off'.

For now the package location has been changed to reflect this. I've submitted a pull request but it doesn't look like it's been touched in a while so I'm not sure it's going to get merged.

package.json

@@ -23,7 +23,7 @@
     "request": "2.49.x",
     "sonos": "0.8.x",
     "telldus-live": "0.2.x",
-    "unofficial-nest-api": "0.1.x",
+    "unofficial-nest-api": "git+https://github.com/hachidorii/unofficial_nodejs_nest.git#d8d48edc952b049ff6320ef99afa7b2f04cdee98",
     "wemo": "0.2.x",
     "wink-js": "0.0.5",
     "xml2js": "0.4.x",

platforms/Nest.js

@@ -186,7 +186,6 @@ NestThermostatAccessory.prototype = {
         var targetTemperatureType = 'off';
         switch(targetHeatingCooling) {
             case 0:
-                // this will crash unnofficial-node-api, it needs to be forked to accept the input
                 targetTemperatureType = 'off';
                 break;
             case 1: