spesmilo / spesmilo/electrum

Error connecting to watchtower

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Python
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Description

ERROR | lnworker.LNWallet.[default_wallet] | Exception in sync_with_remote_watchtower: TypeError('can only concatenate str (not "int") to str')
Traceback (most recent call last):
  File "electrum/util.py", line 1244, in wrapper
  File "electrum/lnworker.py", line 742, in sync_with_remote_watchtower
  File "electrum/lnworker.py", line 751, in sync_channel_with_watchtower
TypeError: can only concatenate str (not "int") to str

I have one lightning channel open (on ACINQ), which had 0 transactions apart from the initial creation.

Watchtower seems to be accessible (it opens the port, I can telnet to it). Configured according to the docs with my domain and a letsencrypt ssl cert.

Client: Electrum 4.3.4 on macOS (x86_64) downloaded from https://electrum.org/#download
Watchtower Server: Electrum 4.0.9 on Debian 11 (x86_64) with Python 3.9.2, installed from apt

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with electrum/lnworker.py at sync_with_remote_watchtower (line 742) and sync_channel_with_watchtower (line 751), using the reported Electrum 4.3.4 client and 4.0.9 server setup. Reproduce the connection attempt against the configured watchtower and determine why the reported string/integer TypeError occurs; done means synchronization no longer raises this traceback.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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