Fix OpenEVSE#434: Implement Uptime

api.yml

@@ -773,10 +773,14 @@ paths:
                     x-stoplight:
                       id: 7h1cpgfjj5j9j
                     format: date-time
+                  uptime:
+                    type: integer
+                    description: EVSE gateway uptime, in seconds
                 required:
                   - time
                   - offset
                   - local_time
+                  - uptime
       operationId: get-time
       description: Gets the time set on the OpenEVSE
     post:

models/Status.yaml

@@ -175,3 +175,6 @@ properties:
   limit_version:
     type: integer
     description: /limit endpoint current version
+  uptime:
+    type: integer
+    description: EVSE gateway uptime, in seconds

src/time_man.cpp

@@ -258,6 +258,18 @@ String time_format_time(tm &time)
   return String(output);
 }
 
+
+// inspired from https://www.snad.cz/en/2018/12/21/uptime-and-esp8266/
+// this works if this method is called at least once every 47 days, which is the case (each 8 hours at least based on TIME_POLL_TIME)
+uint64_t millis64() 
+{
+    static uint32_t low32, high32;
+    uint32_t new_low32 = millis();
+    if (new_low32 < low32) high32++;
+    low32 = new_low32;
+    return (uint64_t) high32 << 32 | low32;
+}
+
 void TimeManager::serialise(JsonDocument &doc)
 {
   // get the current time
@@ -278,4 +290,5 @@ void TimeManager::serialise(JsonDocument &doc)
   doc["time"] = time;
   doc["local_time"] = local_time;
   doc["offset"] = offset;
+  doc["uptime"] = millis64() / 1000;
 }

src/time_man.h

@@ -64,4 +64,6 @@ extern void time_set_time(struct timeval set_time, const char *source);
 extern String time_format_time(time_t time, bool local = true);
 extern String time_format_time(tm &time);
 
+extern unsigned long uptime();
+
 #endif // _OPENEVSE_TIME_H