Show COVID-19 exposure notification statistics

Based on !390 (merged)

Displays how many unique MACs (aka phones) which send exposure notifications have been seen during the last 100 seconds.

It tries to distinguish between Apple and Google devices based on a heuristic mentioned in https://github.com/znuh/microbit-corona-scanner. The user can choose if they want the LEDs and/or the vibration motor to show newly discovered MACs / exposure notifications.

Loosely based on:

• https://github.com/kauzu/CoronaAppDetector
• https://github.com/frankrieger/CoronaAppDetectorM5StickC
• https://github.com/znuh/microbit-corona-scanner

Most of the logic resides in a plain Python script and can be modified by the user as needed.

preload/apps/en_count/__init__.py

@@ -8,11 +8,12 @@ import color
 DM_ADV_TYPE_FLAGS = 0x01
 DM_ADV_TYPE_16_UUID = 0x03
 DM_ADV_TYPE_SERVICE_DATA = 0x16
-UUID = b'\x6f\xfd'
+UUID = b"\x6f\xfd"
 TIMEOUT = 100
 
 seen = {}
 
+
 def parse_advertisement_data(data):
     ads = {}
 
@@ -23,24 +24,27 @@ def parse_advertisement_data(data):
         p += 1
         if ad_len > 0:
             ad_type = data[p]
-            ad_data = b''
+            ad_data = b""
             p += 1
             if ad_len > 1:
-                ad_data = data[p:p+ad_len - 1]
+                ad_data = data[p : p + ad_len - 1]
                 p += ad_len - 1
             ads[ad_type] = ad_data
     return ads
 
-def bytes2hex(bin, sep=''):
+
+def bytes2hex(bin, sep=""):
     return sep.join(["%02x" % x for x in bin])
 
+
 def process_covid_dada(mac, service_data, rssi, flags):
     vibra.vibrate(10)
-    print(bytes2hex(mac, ':'), rssi, bytes2hex(service_data), flags)
+    print(bytes2hex(mac, ":"), rssi, bytes2hex(service_data), flags)
 
     # try to produce a small int
     seen[mac] = [int(time.time() - t0), flags]
 
+
 def prune():
     global seen
     seen_pruned = {}
@@ -52,13 +56,14 @@ def prune():
 
     seen = seen_pruned
 
+
 def process_scan_report(scan_report):
     ads = parse_advertisement_data(scan_report[0])
     mac = scan_report[4]
     mac = bytes([mac[5], mac[4], mac[3], mac[2], mac[1], mac[0]])
     rssi = scan_report[1]
 
-    #print(bytes2hex(mac, ':'), rssi, bytes2hex(scan_report[0]), ads)
+    # print(bytes2hex(mac, ':'), rssi, bytes2hex(scan_report[0]), ads)
     # According to spec there is no other service announced and the
     # service is always listed in the complete list of 16 bit services
     if DM_ADV_TYPE_16_UUID in ads:
@@ -70,6 +75,7 @@ def process_scan_report(scan_report):
                 # service data contains another copy of the service UUID
                 process_covid_dada(mac, ads[DM_ADV_TYPE_SERVICE_DATA][2:], rssi, flags)
 
+
 def ble_callback(_):
     event = sys_ble.get_event()
     prune()
@@ -79,6 +85,7 @@ def ble_callback(_):
             return
         process_scan_report(scan_report)
 
+
 t0 = time.time()
 disp = display.open()
 
@@ -110,6 +117,6 @@ while True:
     disp.print("Apple:  %d" % seen_apple, posy=40, fg=color.BLUE)
     disp.print("Total:  %d" % seen_total, posy=60, fg=color.WHITE)
     disp.update()
-    #print(seen)
+    # print(seen)
 
     time.sleep(1)