Reading from the serial is unreliable.

[M0hammedImran]

This is my code.

export class SerialConnection {
    options: { path: string; baudRate: number; highWaterMark: number; autoOpen: boolean };
    port: LinuxPortBinding;

    constructor({ uartPort, baudRate }: createSerialConnectionProps) {
        this.options = { path: uartPort, baudRate, highWaterMark: 1024 * 128, autoOpen: false };
    }

    public async writeToBuffer(input: string) {
        console.log(`⚓️ | input`, input);
        this.port = await LinuxBinding.open(this.options);

        if (!this.port.isOpen) {
            throw new Error('Port is not open');
        }

        await this.port.write(Buffer.from(input + '\n'));

        const inputBuffer = Buffer.alloc(2 ** 17);

        const data = await this.port.read(inputBuffer, 0, 2 ** 15);

        const stringBuffer = String(data.buffer).replaceAll('\x00', '').trim();

        this.port.close();
        return data
    }
}

Whenever I write something to serial, I expect a response. The responses usually ends with Done.

But when I tried to run the code on Raspberry Pi 3. The response is unreliable. Sometimes its 'D', 'Do' and <empty string>.

Is there something wrong with my code, or is there something I can do to improve the reliability.
Here's the codebase https://github.com/m0hammedimran/serial-io