From ueno at nayuta.co  Wed May  9 04:49:40 2018
From: ueno at nayuta.co (Hiroshi UENO)
Date: Wed, 9 May 2018 13:49:40 +0900
Subject: [Lightning-dev] Receiving via unpublished channels
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Message-ID: <5f9fd03c-6753-65a2-3f25-7556bede9a42@nayuta.co>

Hi, ZmnSCPxj.

 > 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

Our node(ptarmigan) discard `channel_update` without `channel_announcement`.
We want to implement it.

I have some questions.
   * Does `channel_update` send only for `announce_channel == 0`(in` open_channel.channel_flags`) ?
   * Does `channel_update` send every time after `funding_locked` sending(established and reconnection) ?


Regards,
nayuta-ueno

On 2018/04/27 8:35, ZmnSCPxj via Lightning-dev 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 In order to receive via an unpublished channel, we need to know what onLightning fees the other side of that channel wants to charge.?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 However, in case of an unpublished channel, we do not send channel_announcement, and in that case we do not send channel_update.?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 regardless of published/unpublished state).?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
> 
> 
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-- 
//????Nayuta
//  ????(Hiroshi Ueno)
//     email: ueno at nayuta.co