Add CLI args for broker address and port

Cargo.toml

@@ -8,3 +8,4 @@ tokio = { version = "1", features = ["full"] }
 rumqttc = "0.24"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+clap = { version = "4", features = ["derive"] }

README.md

@@ -12,9 +12,14 @@ A simple Rust application that publishes messages to an MQTT broker.
 ## Usage
 
 ```bash
-cargo run
+cargo run -- --broker 192.168.1.100 --port 1883
 ```
 
+### Arguments
+
+- `broker`: MQTT broker address (default: `localhost`)
+- `port`: MQTT broker port (default: `1883`)
+
 ## Configuration
 
 Edit `src/main.rs` to customize:

src/main.rs

@@ -1,13 +1,26 @@
+use clap::Parser;
 use rumqttc::{AsyncClient, Event, MqttOptions, Packet, QoS};
 use std::time::Duration;
 use tokio::time::sleep;
 
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[arg(default_value = "localhost")]
+    broker: String,
+
+    #[arg(default_value_t = 1883)]
+    port: u16,
+}
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = Args::parse();
+
     let mut mqttoptions = MqttOptions::new(
         "mqtt-publisher",
-        "localhost",
+        args.broker,
-        1883,
+        args.port,
     );
     mqttoptions.set_keep_alive(Duration::from_secs(30));