added __version__ file, Async.start() handles cases where no commands are subscribed

Author: Brendan Whitfield

obd/__init__.py

@@ -36,8 +36,7 @@
 #                                                                      #
 ########################################################################
 
-__version__ = '0.3.0'
-
+from .__version__ import __version__
 from .obd import OBD
 from .OBDCommand import OBDCommand
 from .commands import commands

obd/__version__.py

@@ -0,0 +1,2 @@
+
+__version__ = '0.3.0'

obd/async.py

@@ -52,11 +52,14 @@ def __init__(self, portstr=None, baudrate=38400):
     def start(self):
         """ Starts the async update loop """
         if self.is_connected():
-            debug("Starting async thread")
-            self.running = True
-            self.thread = threading.Thread(target=self.run)
-            self.thread.daemon = True
-            self.thread.start()
+            if len(self.commands) > 0:
+                debug("Starting async thread")
+                self.running = True
+                self.thread = threading.Thread(target=self.run)
+                self.thread.daemon = True
+                self.thread.start()
+            else:
+                debug("Async thread not started because no commands were registered")
         else:
             debug("Async thread not started because no connection was made")
 

obd/obd.py

@@ -31,7 +31,7 @@
 
 import time
 
-from obd import __version__
+from .__version__ import __version__
 from .elm327 import ELM327
 from .commands import commands
 from .utils import scanSerial, Response