NTP Timezone & Enable/Disable Setting (#80)

* quick and dirty WIP to investigate timezones, currently only building under esp8266 platform
much of the status stuff has been stripped for now, to test the concepts

* support set of common features across ESP32/ESP8266 WRT timezone and sntp
return dates as ISO format strings

* remove time library, and timelib fix which is no longer required

* fix the icons

* remove temporary changes to demo project

Author: rjwats

data/config/ntpSettings.json

@@ -1,4 +1,6 @@
 {
-  "server": "pool.ntp.org",
-  "interval": 3600
+  "enabled": true,
+  "server": "time.google.com",
+  "tz_label": "Europe/London",
+  "tz_format": "GMT0BST,M3.5.0/1,M10.5.0"
 }

interface/.env.development

@@ -1,3 +1,3 @@
 # Change the IP address to that of your ESP device to enable local development of the UI.
 # Remember to also enable CORS in platformio.ini before uploading the code to the device.
-REACT_APP_ENDPOINT_ROOT=http://192.168.0.20/rest/
+REACT_APP_ENDPOINT_ROOT=http://192.168.0.29/rest/

interface/src/constants/NTPStatus.js

@@ -1,31 +1,27 @@
 import * as Highlight from '../constants/Highlight';
 
-export const NTP_TIME_NOT_SET = 0;
-export const NTP_TIME_NEEDS_SYNC = 1;
-export const NTP_TIME_SET = 2;
+export const NTP_INACTIVE = 0;
+export const NTP_ACTIVE = 1;
 
-export const isSynchronized = ntpStatus => ntpStatus && (ntpStatus.status === NTP_TIME_NEEDS_SYNC || ntpStatus.status === NTP_TIME_SET);
+export const isNtpActive = ntpStatus => ntpStatus && ntpStatus.status === NTP_ACTIVE;
 
 export const ntpStatusHighlight = ntpStatus => {
-  switch (ntpStatus.status){
-    case NTP_TIME_SET:
+  switch (ntpStatus.status) {
+    case NTP_INACTIVE:
+      return Highlight.IDLE;
+    case NTP_ACTIVE:
       return Highlight.SUCCESS;
-    case NTP_TIME_NEEDS_SYNC:
-      return Highlight.WARN;
-    case NTP_TIME_NOT_SET:
     default:
       return Highlight.ERROR;
   }
 }
 
 export const ntpStatus = ntpStatus => {
-  switch (ntpStatus.status){
-    case NTP_TIME_SET:
-      return "Synchronized";
-    case NTP_TIME_NEEDS_SYNC:
-      return "Synchronization required";
-    case NTP_TIME_NOT_SET:
-      return "Time not set"
+  switch (ntpStatus.status) {
+    case NTP_INACTIVE:
+      return "Inactive";
+    case NTP_ACTIVE:
+      return "Active";
     default:
       return "Unknown";
   }