Requirements of bolt12 payments and onion messages

[openoms]

Do I need to be connected to nodes which support onion messaging to be able to use lndk?
Which nodes those would be?

Currently when running:

lndk-cli get-invoice lno1pqqkgzsyw3jhxaqkyypql3lx9jv4dg6tekarpxjgp8x067ku4e9ckezv4jqmfhzc6sazg7g 

or

lndk-cli pay-offer lno1pqqkgzsyw3jhxaqkyypql3lx9jv4dg6tekarpxjgp8x067ku4e9ckezv4jqmfhzc6sazg7g 

getting the error:

ERROR connecting: tonic::transport::Error(Transport, hyper::Error(Connect, Custom { kind: InvalidData, error: InvalidMessage(InvalidContentType) }))

BOLTZ CLN is my only non-lnd peer so wondering if that is the problem.

[orbitalturtle]

Ah looks like the cli is having trouble connecting to the lndk server:

lndk/src/cli.rs

Line 193 in 1cf2906

println!("ERROR connecting: {e:?}");

Is the lndk binary running? And did it properly generate self-signed tls certificates in ~/.lndk?

[openoms]

Thank you that was it. I am running lndk on a non-default port and also need to specify mainnet so the correct command looks like:

lndk-cli -n mainnet --grpc-port=5635 pay-offer lno1pqqkgzsyw3jhxaqkyypql3lx9jv4dg6tekarpxjgp8x067ku4e9ckezv4jqmfhzc6sazg7g

The LND node is connected to the destination CLN node as a peer and can pay BOLT11 invoices through 4 hops.
Still getting the error:

Error paying for offer: Status { code: Internal, message: "Internal error: Error routing payment: Status { code: Unknown, message: \"unable to find a path to destination\", metadata: MetadataMap { headers: {\"content-type\": \"application/grpc\"} }, source: None }", metadata: MetadataMap { headers: {"content-type": "application/grpc", "date": "Thu, 05 Sep 2024 05:05:13 GMT", "content-length": "0"} }, source: None }

end of lndk logs:

Sep 05 05:05:12 raspiblitz-amd64 lndk[2149645]: 2024-09-05T05:05:12.408417560+00:00 INFO lndk - Successfully verified invoice for payment_id 9aaf9e86096c45c8147d992e8f5d7b81db0967e7cef1ff07d825fd9da5c05c9d
Sep 05 05:05:13 raspiblitz-amd64 lndk[2149645]: 2024-09-05T05:05:13.828973925+00:00 DEBUG lndk - Attempting to pay invoice with introduction node Some("020fc7e62c9956a34bcdba309a4809ccfd7adcae4b8b644cac81b4dc58d43a2479")

EDIT:
Turns out the issue was that the amount of the offer was 100 msats which was failing.

Creating another offer with an amount of 1000 msats:

lightning-cli offer 1000 test1sat

yields an offer lno1pqpq86q2pp6x2um5x9ekzaqkyypql3lx9jv4dg6tekarpxjgp8x067ku4e9ckezv4jqmfhzc6sazg7g
which can be paid successfully with 2 LND + LDK nodes I tried:

lndk-cli -n mainnet --grpc-port=5635 pay-offer lno1pqpq86q2pp6x2um5x9ekzaqkyypql3lx9jv4dg6tekarpxjgp8x067ku4e9ckezv4jqmfhzc6sazg7g
Successfully paid for offer!

Thank you for the help here!
Making this work on the Raspiblitz: raspiblitz/raspiblitz#4726

[orbitalturtle]

Awesome! Love that you're adding support for v0.2.0 on the Raspiblitz. ❤️

Turns out the issue was that the amount of the offer was 100 msats which was failing.

Ah yup in my experience, the same thing often occurs for 1000msat/1sat payments, but 10000msats/10sats works pretty consistently.