YACWC

radio_code/rfm69_gateway/packet_analyze.py

@@ -0,0 +1,43 @@
+import os
+import pickle
+import struct
+
+
+with open('packet_dump','rb') as ff:
+    packet = pickle.load(ff)
+
+def get_3byte_hash(packet):
+    hashed = 0;
+    for x in packet:
+        hashed = (hashed*31 + x)  % 0xFFFFFF
+
+    return hashed
+
+def get_bytes(value):
+    return list(value.to_bytes(4, byteorder='little'))
+    
+to_id = packet[0]
+from_id = packet[1]
+msg_format = packet[2]
+msg_type = packet[3]
+
+
+name = packet[4:14]
+wheel_diameter = packet[14:24]
+battery_reading = struct.unpack('<' + 'H', packet[24:26])[0]
+time_reading = struct.unpack('<'+'B'*5, packet[26:31])
+wheel_counts = struct.unpack('<'+'H'*15, packet[31:61])
+b1, b2, b3 = struct.unpack('<BBB',packet[61:64])
+hash_from_msg = b1 | b2<<8 | b3<<16
+hash_calculated = get_hash(packet[4:61])
+
+
+if hash_calculated == hash_from_msg:
+    print('Hashes match!')
+
+else:
+    print("Hashes do not match")
+
+
+
+