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Merge pull request #804 from graynode/rfcomm-tx-credit-goes-negative-fix

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Fixed bug where it's possible for rfcomm tx_credit to go negative resulting in l2cap disconnect from peripheral
This commit is contained in:
Gilles Boccon-Gibod
2025-10-26 14:25:29 +01:00
committed by GitHub
parent 95225a1774 4b25b3581d
commit 578f7f054d
1 changed files with 7 additions and 3 deletions
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10
bumble/rfcomm.py
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@@ -674,10 +674,14 @@ class DLC(utils.EventEmitter):
while (self.tx_buffer and self.tx_credits > 0) or rx_credits_needed > 0:
# Get the next chunk, up to MTU size
if rx_credits_needed > 0:
chunk = bytes([rx_credits_needed]) + self.tx_buffer[: self.mtu - 1]
self.tx_buffer = self.tx_buffer[len(chunk) - 1 :]
chunk = bytes([rx_credits_needed])
self.rx_credits += rx_credits_needed
tx_credit_spent = len(chunk) > 1
if self.tx_buffer and self.tx_credits > 0:
chunk += self.tx_buffer[: self.mtu - 1]
self.tx_buffer = self.tx_buffer[len(chunk) - 1 :]
tx_credit_spent = True
else:
tx_credit_spent = False
else:
chunk = self.tx_buffer[: self.mtu]
self.tx_buffer = self.tx_buffer[len(chunk) :]