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scratch_link.py: Add -r option to retry BLE scan

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Recently, scratch link connection failure is reported. Similar failure
is observed with my environment. I found BTLEDisconnectError happens at
scanner.scan(). Though the true cause of the failure is not yet known, I
found simple retry of scanner.scan() avoids the failure. As a temporary
work around, implement -r or --scan_retry option which specify how many
times to retry the scan. I confirmed that "-r 2" option avoided the
failure.

Signed-off-by: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>
This commit is contained in:
Shin'ichiro Kawasaki
2023-03-21 15:36:38 +09:00
parent d845d69bb8
commit 7050016ee6
1 changed files with 22 additions and 10 deletions
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32
pyscrlink/scratch_link.py
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@@ -318,16 +318,23 @@ class BLESession(Session):
BLESession.found_devices.clear()
for i in range(self.MAX_SCANNER_IF):
scanner = Scanner(iface=i)
try:
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)
found = True
logger.debug(f"BLE device found with iface #{i}");
except BTLEManagementError as e:
logger.debug(f"BLE iface #{i}: {e}");
for j in range(scan_retry):
try:
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)
found = True
logger.debug(f"BLE device found with iface #{i}");
if found:
break
except BTLEDisconnectError as de:
logger.debug(f"BLE iface #{i}: {de}");
except BTLEManagementError as me:
logger.debug(f"BLE iface #{i}: {me}");
if found:
break
else:
found = len(BLESession.found_devices) > 0
return found
@@ -534,11 +541,14 @@ def stack_trace():
def main():
global scan_seconds
global scan_retry
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')
parser.add_argument('-r', '--scan_retry', type=int, default=1,
help='specifiy retry times to scan BLE devices')
args = parser.parse_args()
if args.debug:
print("Print debug messages")
@@ -546,7 +556,9 @@ def main():
handler.setLevel(logLevel)
logger.setLevel(logLevel)
scan_seconds = args.scan_seconds
scan_retry = args.scan_retry
logger.debug(f"set scan_seconds: {scan_seconds}")
logger.debug(f"set scan_retry: {scan_retry}")
# Prepare certificate of the WSS server
gencert.prep_cert()