I have to automate and test the happy path of a command line tool hosted in an AWS server. I am stuck in simulating a F2 key. Is there a way, we could pass it to the server as bytes? A sample example code is added below. F2 is needed as it is used to save the entry.

describe(testName, async()=>{
 it('Verify Connection', async(done) => {
    const stream = await conPromise.connectPromise();
    const writable = await fs.createWriteStream('file.txt');
     await sleep(5000);
     await stream.write('3\n');
     await sleep(5000);
     await stream.write('T\n');       
 });
})

Please help out with some suggestions as I have tried many and failed.