feat: Publish all magnet statuses.

The combined status of all open magnets is now published to extra topic.
This enables you to use this new topic for easier security monitoring.

README.md

@@ -105,6 +105,14 @@ Each status message is retained, so if you subscribe after a status message, you
 
 The statuses of the devices are multicasted over the network if you enbaled this (you SHOULD!!). So all the updates to mqtt are near instant.
 
+### Security message
+
+The total count of magnet sensors with the `open` state will be emitted to: `xiaomi/status/magnets` as a JSON object containing the following fields.
+
+- `name` Either `All closed` or comma seperated list of magnet names with open status.
+- `ids` the ids of the magnets with the status `open` as array.
+- `val` number of open devices
+
 ### Setting the gateway light
 
 You can control the gateway light (if you've set-up the gateway password) by sending a message to `xiaomi/set/gateway_id/light`, send one of these:

src/bridge.js

@@ -223,6 +223,21 @@ function publishMagnetState (device, newState) {
     magnets.push({id: device.getSid(), state: newState})
   }
   publishDeviceData(device, newState)
+  publishOpenMagnetCount()
+}
+
+function publishOpenMagnetCount () {
+  const openMagnets = magnets.filter(m => m.state === 'open')
+  let data = {
+    val: openMagnets.length,
+    name: 'All closed',
+    ts: Date.now()
+  }
+  if (openMagnets.length > 0) {
+    data.ids = openMagnets.map(m => m.id)
+    data.name = openMagnets.map(m => getFriendlyName(m.id)).sort().join(', ')
+  }
+  mqttClient.publish(`${config.name}/status/magnets`, JSON.stringify(data), {qos: 0, retain: true})
 }
 
 function publishHTSensor (sensorDevice) {