i_ack Function

Once the i_receive function is executed, an acknowledgment is generated from Router's destination chain Gateway contract, which will specify whether the calls were successful. We need to implement an i_ack function in our contract with the following schema:

fn i_ack(&self, request_identifier: U128, exec_flag: bool, exec_data: Vec<u8>);

You need to handle the acknowledgment inside this function. This function receives the following params:

1) request_identifier

This is the same nonce you receive while calling the i_send() function on the source chain Gateway contract. Using this nonce, you can map the acknowledgment to a particular request.

2) exec_flag

exec_flag is a boolean value that tells you the execution status of your request on destination chain.

3) exec_data

The exec_data parameter is the data in bytes that provides the abi-encoded return value from the i_receive call on the destination chain. Based on the application's requirement, this data can be decoded and processed on the source chain.