Relay IBC packets in test code

[ethanfrey]

We want to be able to query an IBC packet from one chain and post it to another, along with the appropriate block header and any merkle proofs needed.

This may be useful for setting up test vectors in #494 (if you can survive flying blind for a bit). It is not blocked on #492, as we want that later, but for now can blindly trust the headers we get from the chain (they will be verified on the other side anyway).

We will need 2 chains (simapp) in CI to test this.

This is the Go relayer you can use for reference: https://github.com/cosmos/relayer In particular the following commands:

• rly tx link demo -d -o 3s (this sets up the client, connection, and maybe channel)
• rly tx transfer ibc-0 ibc-1 1000000samoleans $(rly chains address ibc-1) (this creates the first outgoing packet)
• rly tx relay demo -d (this sends the packet, and possibly returns the ack)

[willclarktech]

@ethanfrey Is this issue still relevant for CosmJS or is it covered by the ts-relayer project?

[ethanfrey]

This is covered by the relayer. You can close this