Add max 32 bit int as max packet counter (#105)

ait/gui/__init__.py

@@ -727,7 +727,9 @@ def get_packet_delta(pkt_defn, packet):
 
     # previous packets of this type received
     else:
-        counters[pkt_defn.name] += 1
+        count = counters[pkt_defn.name]
+        count = count + 1 if count < 2**31 - 1 else 0
+        counters[pkt_defn.name] = count
         delta, dntoeus = {}, {}
         for field, new_value in json_pkt.items():
             last_value = packet_states[pkt_defn.name][field]
@@ -774,6 +776,7 @@ def handle():
                     delta, dntoeus, counter = get_packet_delta(pkt_defn, data)
                     delta = replace_datetimes(delta)
                     log.info(delta)
+                    log.info('Packet #{}'.format(counter))
 
                     wsock.send(json.dumps({
                         'packet': pkt_defn.name,

ait/gui/static/js/ait/tlm.js

@@ -394,9 +394,11 @@ class TelemetryStream
     checkCounter (packetName, counter) {
         // returns true if counter is as expected, false if not
         let lastCounter = this._counters[packetName]
-        if ( counter == lastCounter + 1 ) {
+        if ( counter == lastCounter + 1) {
             return true
-        } 
+        } else if ( lastCounter == Math.pow(2, 31) - 1 && counter == 0 ) {
+            return true
+        }
         console.log('counter mismatch: had ' + lastCounter + ' , got ' + counter)
         return false
     }