3. Write and compile the smart contract

For the scope of this tutorial, we will publish a simple "Hello Swisstronik" smart contract with only 2 functions -one for writing to the blockchain and one for reading from the blockchain- with 1 state variable.

1. Go to the contracts folder and open the .sol file (smart contract).

We renamed it to Hello_swtr.sol

1. Paste the smart contract into your Hello_swtr.sol file.

Currently, we only support Solidity compilers up to 0.8.19

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.19;

//This contract is only intended for testing purposes

contract Swisstronik {
    string private message;

    /**
     * @dev Constructor is used to set the initial message for the contract
     * @param _message the message to associate with the message variable.
     */
    constructor(string memory _message) payable{
        message = _message;
    }

    /**
     * @dev setMessage() updates the stored message in the contract
     * @param _message the new message to replace the existing one
     */
    function setMessage(string memory _message) public {
        message = _message;
    }

    /**
     * @dev getMessage() retrieves the currently stored message in the contract
     * @return The message associated with the contract
     */
    function getMessage() public view returns(string memory){
        return message;
    }
}

1. Compile the contract

To compile the smart contract, run npx hardhat compile in your terminal (if you are using VSCode, you can open a new terminal with Ctrl + Shift + ` )

After successful compilation:

1. You should get the message Compiled 1 Solidity file successfully in your terminal

2. A new artifacts folder should be created

Now you are ready to deploy this contract on Swisstronik! 🚀