Report the host ip address to the API on startup and every 5mins after.

src/app.coffee

@@ -58,3 +58,12 @@ knex('config').select('value').where(key: 'uuid').then ([uuid]) ->
 	, 5 * 60 * 1000) # Every 5 mins
 	supervisor.update()
 
+	updateIpAddr = ->
+		utils.findIpAddrs().then (ipAddrs) ->
+			application.updateDeviceInfo(
+				ip_address: ipAddrs.join(' ')
+			)
+	console.log('Starting periodic check for IP addresses..')
+	setInterval(updateIpAddr, 5 * 60 * 1000) # Every 5 mins
+	updateIpAddr()
+

src/application.coffee

@@ -222,3 +222,29 @@ exports.update = ->
 			setTimeout(exports.update)
 		# Set the updating as finished
 		currentlyUpdating = 0
+
+exports.updateDeviceInfo = (body) ->
+	Promise.all([
+		knex('config').select('value').where(key: 'apiKey')
+		knex('config').select('value').where(key: 'uuid')
+	])
+	.spread ([{value: apiKey}], [{value: uuid}]) ->
+		resinAPI.get(
+			resource: 'device'
+			options:
+				filter:
+					uuid: uuid
+			customOptions:
+				apikey: apiKey
+		)
+		.then (devices) ->
+			if devices.length is 0
+				throw new Error('Could not find this device?!')
+			deviceID = devices[0].id
+			resinAPI.patch(
+				resource: 'device'
+				id: deviceID
+				body: body
+				customOptions:
+					apikey: apiKey
+			)

src/utils.coffee

@@ -22,3 +22,27 @@ exports.mixpanelTrack = (event, properties={}) ->
 	properties = _.assign(_.cloneDeep(properties), mixpanelProperties)
 
 	mixpanelClient.track(event, properties)
+
+# Returns an array of the host's ip address(es) by parsing the host /proc/net/fib_trie
+exports.findIpAddrs = ->
+	fs.readFileAsync('/mnt/fib_trie', 'utf8')
+	.then (fibtrie) ->
+		prevLine = ''
+		fibtrie.split('\n')
+		.map (line) ->
+			line = line.trim()
+
+			# We only care about LOCAL routes (not UNICAST or BROADCAST)
+			if line.match(/LOCAL$/)
+				# Then we make sure the previous line was an ending branch (and hence contains an IP - 127.0.0.0 has BROADCAST and LOCAL entries)
+				if prevLine.match(/^\|--/)
+					# Then we remove the ending branch bit
+					maybeAddr = prevLine.replace(/^\|--/, '').trim()
+					# And ignore loopback/docker interfaces.
+					# TODO: Docker interface can technically be on another address range if 172.17
+					if !maybeAddr.match(/^(127.0.0.1|172.17.)/)
+						ipAddr = maybeAddr
+
+			prevLine = line
+			return ipAddr
+		.filter(Boolean)