refactor of Tunnel() for unit testing; create unit tests for Tunnel()

meshtastic/util.py

@@ -210,3 +210,18 @@ def remove_keys_from_dict(keys, adict):
         if key in adict:
             del newdict[key]
     return newdict
+
+
+def hexstr(barray):
+    """Print a string of hex digits"""
+    return ":".join('{:02x}'.format(x) for x in barray)
+
+
+def ipstr(barray):
+    """Print a string of ip digits"""
+    return ".".join('{}'.format(x) for x in barray)
+
+
+def readnet_u16(p, offset):
+    """Read big endian u16 (network byte order)"""
+    return p[offset] * 256 + p[offset + 1]