AFAIK, all the other implementations already do this (lnd does at least [1]). As otherwise, it wouldn't be possible to properly utilize routing hints.
> I want to ask the other LN implementations (lnd, eclair, ucoin, lit) As an side, what's "ucoin"? Searched for a bit and didn't find anything notable. [1]: https://github.com/lightningnetwork/lnd/blob/master/discovery/gossiper.go#L1747 On Thu, Apr 26, 2018 at 4:35 PM ZmnSCPxj via Lightning-dev < lightning-dev@lists.linuxfoundation.org> wrote: > Good morning list, > > While implementing support for `r` field in invoices, I stumbled upon some > issues regarding *creating* invoices with `r` fields. > > In order to receive via an unpublished channel, we need to know what > onLightning fees the other side of that channel wants to charge. We cannot > use our own onLightning fees because our fees apply if we were forwarding > to the other side. > > However, in case of an unpublished channel, we do not send > channel_announcement, and in that case we do not send channel_update. So > the other side of the channel never informs us of the onLightning fees they > want to charge if we would receive funds by this channel. > > An idea we want to consider is to simply send `channel_update` as soon as > we lock in the channel: > https://github.com/ElementsProject/lightning/pull/1330#issuecomment-383931817 > > I want to ask the other LN implementations (lnd, eclair, ucoin, lit) if we > should consider standardizing this behavior (i.e. send `channel_update` > after lockin regardless of published/unpublished state). It seems > back-compatible: software which does not expect this behavior will simply > drop the `channel_update` (as they do not follow a `channel_announcement`). > > In any case, what was the intended way to get the onLightning fee rates to > put into invoice `r` fields for private routes? > > Regards, > ZmnSCPxj > _______________________________________________ > Lightning-dev mailing list > Lightning-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev >
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