Tag version 0.2.4

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

README.md

@@ -42,7 +42,7 @@ Linux distros:
 * elementary OS 5.1 Hera
 
 Browsers:
-* FireFox
+* Firefox
 * Chromium
 
 It was reported that pyscrlink (former bluepy-scratch-link) working with
@@ -51,7 +51,7 @@ following devices and Linux distros.
 Devices:
 * LEGO Mindstorm EV3 by @chrisglencross
 * LEGO WeDo by @zhaowe, @KingBBQ
-* LEGO Boost by @laurentchar, @miguev, @jacquesdt
+* LEGO Boost and compatible devices by @laurentchar, @miguev, @jacquesdt, @n3storm
 * Intelino Smart Train by @ErrorJan
 * toio by @shimodash
 
@@ -59,6 +59,7 @@ Linux distros:
 * Raspbian by @chrisglencross
 * Ubuntu 16.04 @jacquesdt
 * Ubuntu Studio 20.04 @miguev
+* Debian 11 @n3storm
 
 Installation
 ------------
@@ -87,7 +88,8 @@ Installation
     $ pip3 install pyscrlink
     ```
 
-4. For Bluetooth Low Energy (BLE) devices, set bluepy-helper capability.
+4. Set bluepy-helper capability.
+   This step is required for most of devices except LEGO Mindstorm EV3.
 
     ```
     $ bluepy_helper_cap
@@ -159,6 +161,8 @@ Usage
     ```sh
     $ scratch_link
     ```
+    If your device is toio, add "-s 1" option to the scratch_link command. It
+    allows the toio Do Visual Programming to connect to toio automatically.
 
 3. Connect scratch to the target device such as micro:bit or LEGO Mindstorms:
     * Open FireFox or Chrome. (Make sure to run as the same user for scratch-link python script.)
@@ -202,6 +206,15 @@ Please file issues to [GitHub issue tracker](https://github.com/kawasaki/pyscrli
 Releases
 --------
 
+Release 0.2.4
+
+* Added -s option to specify BLE scan duration
+* Improved README.md
+
+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

@@ -8,12 +8,14 @@ import asyncio
 import pathlib
 import ssl
 import websockets
+import socket
 import json
 import base64
 import logging
 import sys
 import signal
 import traceback
+import argparse
 
 # for Bluetooth (e.g. Lego EV3)
 import bluetooth
@@ -42,6 +44,9 @@ logger.setLevel(logLevel)
 logger.addHandler(handler)
 logger.propagate = False
 
+HOSTNAME="device-manager.scratch.mit.edu"
+scan_seconds=10.0
+
 class Session():
     """Base class for BTSession and BLESession"""
     def __init__(self, websocket, loop):
@@ -492,6 +497,7 @@ class BLESession(Session):
         return False
 
     def _scan_devices(self, params):
+        global scan_seconds
         if BLESession.nr_connected > 0:
             return len(BLESession.found_devices) > 0
         found = False
@@ -502,7 +508,8 @@ class BLESession(Session):
                 for i in range(self.MAX_SCANNER_IF):
                     scanner = Scanner(iface=i)
                     try:
-                        devices = scanner.scan(10.0)
+                        logger.debug(f"start BLE scan: {scan_seconds} seconds")
+                        devices = scanner.scan(scan_seconds)
                         for dev in devices:
                             if self.matches(dev, params['filters']):
                                 BLESession.found_devices.append(dev)
@@ -715,18 +722,20 @@ def stack_trace():
          print(line)
 
 def main():
-    opts = [opt for opt in sys.argv[1:] if opt.startswith("-")]
-    if "-h" in opts:
-        print((f"Usage: {sys.argv[0]} [OPTS]\n"
-               "OPTS:\t-h Show this help.\n"
-               "\t-d Print debug messages."
-        ))
-        sys.exit(1)
-    elif "-d" in opts:
+    global scan_seconds
+    parser = argparse.ArgumentParser(description='start Scratch-link')
+    parser.add_argument('-d', '--debug', action='store_true',
+                        help='print debug messages')
+    parser.add_argument('-s', '--scan_seconds', type=float, default=10.0,
+                        help='specifiy duration to scan BLE devices in seconds')
+    args = parser.parse_args()
+    if args.debug:
         print("Print debug messages")
         logLevel = logging.DEBUG
         handler.setLevel(logLevel)
         logger.setLevel(logLevel)
+    scan_seconds = args.scan_seconds
+    logger.debug(f"set scan_seconds: {scan_seconds}")
 
     # Prepare certificate of the WSS server
     gencert.prep_cert()
@@ -738,7 +747,7 @@ 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 +758,13 @@ 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="0.2.4",
     author="Shin'ichiro Kawasaki",
     author_email='kawasaki@juno.dti.ne.jp',
     description='Scratch-link for Linux with Python',