Add simple lib, utility to check mhz.

python/.gitignore

@@ -0,0 +1,69 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask instance folder
+instance/
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# IPython Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version

python/adsblib.py

@@ -0,0 +1,9 @@
+import json
+import socket
+
+
+def GetEvents(host, port):
+	with socket.create_connection((host, port)) as sock:
+		fh = sock.makefile()
+		for line in fh:
+			yield json.loads(line)

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)