Adding USB reset.

Author: Rob Bultman

README.md

@@ -130,7 +130,8 @@ The **Message Type** field is a 1-byte value that is meant to indicate to the re
 |0x0a|Update Resource|JSON|
 |0x0b|Resource Updated|JSON|
 |0x0c|Set device UUID|String|
-|0x0d-0x0F|Reserved for Future Use|n/a|
+|0x0d|Keepalive|none|
+|0x0e-0x0F|Reserved for Future Use|n/a|
 |0x10|filterAlert|Unsigned, 8-bit integer|
 |0x11|waterFilterCalendarTimer|Unsigned, 16-bit integer|
 |0x12|waterFilterCalendarPercentUsed|Unsigned, 8-bit integer|

chillhub-devices.js

@@ -33,6 +33,7 @@ function ChillhubDevice(ttyPath, receive, announce) {
    self.registered = false;
    self.deviceRegTimer = null;
    self.resourceRegTimer = null;
+   self.keepaliveTimer = null;
    self.deviceRegCount = 5;
 
    self.uid = ttyPath;
@@ -335,6 +336,7 @@ function ChillhubDevice(ttyPath, receive, announce) {
                      console.log("Attachment successfully created.");
                      self.resources = resources;
                      self.registered = true;
+                     self.keepaliveTimer = setInterval(self.sendKeepalive, 2500);
                   }
                });
             } 
@@ -418,6 +420,16 @@ function ChillhubDevice(ttyPath, receive, announce) {
       });
    }
 
+   self.sendKeepalive = function () {
+      self.send({
+         type: 0x0d,
+         content: {
+            numericType: 'U8',
+         numericValue: 1
+         }
+      });
+   }
+
    self.checkForDeviceRegistration = function checkForDeviceRegistration() {
       if (self.deviceRegCount <= 0) {
          resetUSB();
@@ -446,6 +458,9 @@ var removeDevice = function(device) {
    if (devices[device].deviceRegTimer != null) {
       clearTimeout(devices[device].deviceRegTimer);
    }
+   if (devices[device].keepaliveTimer != null) {
+      clearInterval(devices[device].keepaliveTimer);
+   }
    devices[device].cleanup();
    delete devices[device];
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chillhub-firmware",
-  "version": "0.1.10",
+  "version": "0.1.11",
   "description": "ChillHub is a system for creating USB devices that extend the functionality of your fridge. It consists of a raspberry pi (http://www.raspberrypi.org/), a green bean (https://firstbuild.com/greenbean/), and a USB hub in a refrigerator door. ChillHub acts as a mailman the delivers messages from the cloud and the fridge to USB devices and from the USB devices back to the cloud.",
   "main": "chillhub.js",
   "scripts": {