ur20-modbus 0.5.0

Modbus TCP fieldbus coupler (`UR20-FBC-MOD-TCP`) implementation
Documentation 
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use std::error::Error;
use ur20_modbus::Coupler;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let addr = "192.168.0.222:502".parse()?;
    let mut coupler = Coupler::connect(addr).await?;
    let id = coupler.id().await?;
    println!("Connected to {id}");
    coupler.set_output(
        &ur20::Address {
            module: 3,
            channel: 2,
        },
        ur20::ChannelValue::Bit(true),
    )?;
    coupler.tick().await?;
    Ok(())
}