Add simple lib, utility to check mhz.

python/check_mhz.py

@@ -0,0 +1,32 @@
+#!/usr/bin/python3
+
+import sys
+import time
+
+import adsblib
+
+
+if len(sys.argv) != 3:
+	print('Usage: %s <host> <port>' % sys.argv[0])
+
+advertised_mhz = None
+start_time = None
+start_timestamp = None
+for i, event in enumerate(adsblib.GetEvents(sys.argv[1], sys.argv[2])):
+	advertised_mhz = event.get('mlat_timestamp_mhz', advertised_mhz)
+
+	if 'mlat_timestamp' not in event:
+		continue
+
+	if not start_time:
+		start_time = time.time()
+		start_timestamp = event['mlat_timestamp']
+
+	if i % 1000 == 0 and start_time and advertised_mhz:
+		time_diff = time.time() - start_time
+		value_diff = event['mlat_timestamp'] - start_timestamp
+		measured_mhz = value_diff / time_diff / 1000000
+		print(
+			'\r%d samples, %d seconds, advertised: %d MHz, measured: %d MHz' %
+			(i, time_diff, advertised_mhz, measured_mhz),
+			end='', flush=True)