Don't rely on lucky timings when sending messages from the provider.

lib/db/api.js

@@ -84,6 +84,12 @@ dbapi.setDeviceAbsent = function(serial) {
   }))
 }
 
+dbapi.setDeviceChannel = function(serial, channel) {
+  return db.run(r.table('devices').get(serial).update({
+    channel: channel
+  }))
+}
+
 dbapi.saveDeviceIdentity = function(serial, identity) {
   return db.run(r.table('devices').get(serial).update({
     platform: identity.platform
@@ -105,16 +111,4 @@ dbapi.loadDevice = function(serial) {
   return db.run(r.table('devices').get(serial))
 }
 
-dbapi.ensureDeviceSaved = function(serial) {
-  return dbapi.loadDevice(serial)
-    .then(function(device) {
-      if (!device) {
-        return Promise.delay(100).then(function() {
-          return dbapi.loadDevice(serial)
-        })
-      }
-      return device
-    })
-}
-
 module.exports = dbapi