initial commit

idea from https://blog.serverdensity.com/how-to-monitor-cats/

main.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import json
+import numpy
+import subprocess
+from bluepy.btle import Scanner, DefaultDelegate
+from pprint import pprint
+
+devices = ( {'name': 'charol', 'addr': 'd3:01:00:00:6a:32', 'values': [] }, )
+
+class ScanReport2SD(DefaultDelegate):
+    def handleDiscovery(self, dev, isNewDev, isNewData):
+        if dev.rssi < -128:
+            return
+
+        for d in devices:
+            # quick and dirty
+            try:
+                if d['addr'] == dev.addr:
+                    d['values'].append(dev.rssi)
+            except:
+                continue
+
+def report():
+    data = {} 
+    for d in devices:
+        list = d['values']
+        name = d['name']+'_litter'
+        if list == []:
+            data[name] = 0
+            print("DEBUG {} {}".format(name, list))
+        else:
+            # percentile85 has given good results to filter out cat/signal movement
+            percentile = numpy.percentile(numpy.array(list), 85)
+            # we reset values
+            d['values'] = []
+            # -60 is the rssi thershold we consider in place
+            if percentile < -60:
+                data[name] = 1
+            if percentile >= -60:
+                data[name] = 2
+                subprocess.run(["loginctl", "lock-session"])
+            print("DEBUG {} {} {}".format(name, percentile, list))
+    pprint(data)
+    f = open('/tmp/CatSpy.json', 'w')
+    f.write(json.dumps(data))
+    f.close()
+
+if __name__ == "__main__":
+    scanner = Scanner().withDelegate(ScanReport2SD())
+    print ("Scanning for devices...")
+    while True:
+        scanner.scan(20)
+        report()