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Send ack Example

Send a 2-way message from the source chain to the destination chain, and an "executed" acknowledgment is sent back to the source chain.

Make sure you follow the command above to set up your local .env and start the local chains in a different terminal.

To execute the example, use the following command:

make local-chain-execute FROM={srcChain} TO={destChain} SCRIPT={script} VALUE={gasValue} MESSAGE={message}

Parameters

  • srcChain: The blockchain network from which the message will be relayed. Acceptable values include "Moonbeam", "Avalanche", "Fantom", "Ethereum", and "Polygon".

  • destChain: The blockchain network to which the message will be relayed. Acceptable values include "Moonbeam", "Avalanche", "Fantom", "Ethereum", and "Polygon".

  • script: The contract to execute on the blockchain network.

  • gasValue: The gas amount to pay for cross-chain interactions.

  • message: The message to be relayed between the chains.

Example

This example sends "Hello" from Fantom and gets an acknowledgment message "World" from Polygon.

make local-chain-execute FROM=Fantom TO=Polygon SCRIPT=SendAck VALUE=1 MESSAGE="Hello"

The output will be:

Using local private key for transactions...
SRC_RPC_URL: http://localhost:8548
DEST_RPC_URL: http://localhost:8549
Reading initial state from destination network (POLYGON)...
Message: ""
Executing sendMessage for SendAck...

blockHash               0xa9a084b37455507d18227019ee0b161acd910689f390aa025a603a9ccb7ff393
blockNumber             29
contractAddress
cumulativeGasUsed       60507
effectiveGasPrice       3030987695
gasUsed                 60507
logs                    [{...}]
logsBloom               0x
status                  1
transactionHash         0x274ddcc2f306a9e3a9ec0c82cfc210e94d360d91d32eccceebfe93075aecb1db
transactionIndex        0
type                    2
Transaction sent successfully.
Reading final state from destination network (POLYGON)...

Message: "World"
Operation completed successfully!