The cost to verify a message by the underlying messaging protocol. Can be found by calling the CCI on estimateAdditionalCost.
What is the (wei) cost of gas on the destination chain? Can be found by getting the gas cost on the destination chain (in wei) and converting it into source chain (in wei).
What is the (wei) cost of gas on the source chain. Should be set slightly higher than base gas. (otherwise tx fails.)
The estimated time to verify the message. Should be set slightly longer.
Who should the excess gas (on ack) be refunded to? !Set to an address! Which should likely to be the sender or origin of the transaction.
Encodes a sendAsset into the routers calldata.