xpay phoenix detect#8537
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rustyrussell merged 2 commits intoElementsProject:masterfrom Nov 17, 2025
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…an unknown channel. Signed-off-by: Rusty Russell <[email protected]>
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…e can't route. This attempts to solve a problem we have with Phoenix clients: This payment has been split in two many parts by the sender: 31 parts vs max 6 parts allowed for on-the-fly funding. The problem is that we don't have any way in bolt11 or bolt12 to specify the maximum number of HTLCs. As a workaround, we start by restricting askrene to 6 parts if the node is not openly reachable, and if it struggles, we remove the restriction. This would work much better if askrene handled maxparts more completely! See-Also: ElementsProject#8331 Changelog-Fixed: `xpay` will not try to send too many HTLCs through unknown channels (6, as that is Phoenix's limit) unless it has no choice Signed-off-by: Rusty Russell <[email protected]>
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Based on #8688: this is just the last two commits.
This attempts to solve a problem we have with Phoenix clients:
The problem is that we don't have any way in bolt11 or bolt12 to
specify the maximum number of HTLCs.
As a workaround, we start by restricting askrene to 6 parts if the
node is not openly reachable, and if it struggles, we remove the
restriction. This would work much better if askrene handled maxparts
more completely!
See-Also: #8331