add gsmmodem module to project

gsmmodem/compat.py

@@ -0,0 +1,22 @@
+""" Contains monkey-patched equivalents for a few commonly-used Python 2.7-and-higher functions.
+Used to provide backwards-compatibility with Python 2.6
+"""
+import sys
+if sys.version_info[0] == 2 and sys.version_info[1] < 7:
+    import threading
+    
+    # threading.Event.wait() always returns None in Python < 2.7 so we need to patch it
+    if hasattr(threading, '_Event'): # threading.Event is a function that return threading._Event
+        # This is heavily Python-implementation-specific, so patch where we can, otherwise leave it
+        def wrapWait(func):
+            def newWait(self, timeout=None):
+                func(self, timeout)
+                return self.is_set()            
+            return newWait
+        threading._Event.wait = wrapWait(threading._Event.wait)
+    else:
+        raise ImportError('Could not patch this version of Python 2.{0} for compatibility with python-gsmmodem.'.format(sys.version_info[1]))
+if sys.version_info[0] == 2:
+    str = str
+else:
+    str = lambda x: x