How to do CPFP on CLN?

Support and Troubleshooting
1

I closed a channel and there was no option I saw on CLN or RTL to modify the fee. The fee rate was set at 1.01 sat/vB, and I think its going to be a long, long time before this goes through. I’ve read up on CPFP but I have no idea how to implement this in Umbrel on CLN. I am strictly a novice user when it comes to anything command line interface, so I really quickly hit a brick wall where it doesn’t recognize any of the commands I’ve tried and I have no idea where to go from here. I’ve asked grok “what is the command line script in core lightning node to implement CPFP” and it gives me a bunch of bash scripts, and I’ve tried to input these into the Umbrel terminal window but even something as simple as asking it to list the pending on-chain transactions, and I quickly hit a dead end. Example pasted below.
$ lightning-cli listchaintxns
{
“code”: -32601,
“message”: “Unknown command ‘listchaintxns’”
}

Appreciate any guidance you all can provide!

2

Hi,
I think you might want to accelerate the confirmation of the channel, no?

If so, pull it up on the mempool, click the accelerate button, and be prepared to make an additional payment and your transaction will be prioritized by about 80% of the mining pool.

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D.

3

Yeah I was hoping to avoid that because it was more than a 50,000 sat acceleration fee on a 400k sat channel which seemed ridiculous. Luckily I just waited long enough and it cleared and the channel finally closed. But, now I can’t get the on-chain funds OUT of the CLN node because no matter what I do, it says “Cannot estimate fees (yet)”. This is so frustrating, I want to get this bitcoin out of CLN and close this implementation of it because it’s incredibly unstable on Umbrel for some reason. But I can’t send the funds out of CLN and I even if I tell it in RTL to sweep the on-chain funds to a different address with “urgent” priority, it keeps saying “cannot estimate fees (yet).”