added basic cryptography, advertising, and forwarding functionality to the LoRa handler. Also added a UUID class for generating unique IDs for each device.

also, i have 2 radios now! :D

relay/uuid.py

@@ -0,0 +1,22 @@
+import urandom
+
+def uuid4():
+    b = bytearray(urandom.getrandbits(8) for _ in range(16))
+
+    # Set version (4) -> bits 12-15 of time_hi_and_version
+    b[6] = (b[6] & 0x0F) | 0x40
+
+    # Set variant (RFC 4122)
+    b[8] = (b[8] & 0x3F) | 0x80
+
+    def to_hex(x):
+        return '{:02x}'.format(x)
+
+    return (
+        to_hex(b[0]) + to_hex(b[1]) + to_hex(b[2]) + to_hex(b[3]) + '-' +
+        to_hex(b[4]) + to_hex(b[5]) + '-' +
+        to_hex(b[6]) + to_hex(b[7]) + '-' +
+        to_hex(b[8]) + to_hex(b[9]) + '-' +
+        to_hex(b[10]) + to_hex(b[11]) + to_hex(b[12]) +
+        to_hex(b[13]) + to_hex(b[14]) + to_hex(b[15])
+    )