Tag version 0.2.3

Signed-off-by: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>

README.md

@@ -202,6 +202,10 @@ Please file issues to [GitHub issue tracker](https://github.com/kawasaki/pyscrli
 Releases
 --------
 
+Release 0.2.3
+
+* Fixed eternal loop caused by hostname resolve failure
+
 Release 0.2.2
 
 * Supported multiple device connections for toio

pyscrlink/scratch_link.py

@@ -8,6 +8,7 @@ import asyncio
 import pathlib
 import ssl
 import websockets
+import socket
 import json
 import base64
 import logging
@@ -42,6 +43,8 @@ logger.setLevel(logLevel)
 logger.addHandler(handler)
 logger.propagate = False
 
+HOSTNAME="device-manager.scratch.mit.edu"
+
 class Session():
     """Base class for BTSession and BLESession"""
     def __init__(self, websocket, loop):
@@ -738,7 +741,7 @@ def main():
     ssl_context.load_cert_chain(localhost_cer, localhost_key)
 
     start_server = websockets.serve(
-         ws_handler, "device-manager.scratch.mit.edu", 20110, ssl=ssl_context
+         ws_handler, HOSTNAME, 20110, ssl=ssl_context
     )
 
     while True:
@@ -749,7 +752,13 @@ def main():
         except KeyboardInterrupt as e:
             stack_trace()
             break
+        except socket.gaierror as e:
+            logger.error(f"{type(e).__name__}: {e}")
+            logger.info(f"Check internet connection to {HOSTNAME}. If not "
+                        f"available, add '127.0.0.1 {HOSTNAME}' to /etc/hosts.")
+            break
         except Exception as e:
+            logger.error(f"{type(e).__name__}: {e}")
             logger.info("Restarting scratch-link...")
 
 if __name__ == "__main__":

setup.py

@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="pyscrlink",
-    version="0.2.2",
+    version="0.2.3",
     author="Shin'ichiro Kawasaki",
     author_email='kawasaki@juno.dti.ne.jp',
     description='Scratch-link for Linux with Python',