POLYMER CHALLENGE 3

First complete all the steps mentioned here : First Article

Paste all the command all one by one -

git clone https://github.com/polymerdevs/testnet-challenge-3-template.git

cd testnet-challenge-3-template

cp .env.example .env

nano .env

Use W/A/S/D key to move the cursor and paste the API key and private key in the respective place in between the quotes, no need to paste any things in tenderly token.

Then press ctrl+x then type y and press ENTER

sudo add-apt-repository ppa:git-core/ppa

sudo apt update; apt install git

sudo apt install curl

curl -s https://deb.nodesource.com/setup_18.x | sudo bash

sudo apt install nodejs -y

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"

nvm

nvm install 20

nvm use 20

curl -L https://foundry.paradigm.xyz | bash

source /home/gitpod/.bashrc

foundryup

wget -qO - 'https://proget.makedeb.org/debian-feeds/prebuilt-mpr.pub' | gpg --dearmor | sudo tee /usr/share/keyrings/prebuilt-mpr-archive-keyring.gpg 1> /dev/null
echo "deb [arch=all,$(dpkg --print-architecture) signed-by=/usr/share/keyrings/prebuilt-mpr-archive-keyring.gpg] https://proget.makedeb.org prebuilt-mpr $(lsb_release -cs)" | sudo tee /etc/apt/sources.list.d/prebuilt-mpr.list
sudo apt update

sudo apt install just

just install

You need to Edit the contract CCQueryUC.sol

Open CCQueryUC.sol file and search sendUniversalPacket function

Then paste :

bytes memory payload = abi.encode(msg.sender, "crossChainQuery");

uint64 timeoutTimestamp = uint64((block.timestamp + timeoutSeconds) * 1000000000);

IbcUniversalPacketSender(mw).sendUniversalPacket(
    channelId, IbcUtils.toBytes32(destPortAddr), payload, timeoutTimestamp
);

Example

Again search for onUniversalAcknowledgement function on the same file and again paste this code :

ackPackets.push(UcAckWithChannel(channelId, packet, ack));

(string memory _secretMessage) = abi.decode(ack.data, (string));

emit LogAcknowledgement(_secretMessage);