Initial commit: MQTT publisher with rumqttc

README.md

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+# MQTT Publisher
+
+A simple Rust application that publishes messages to an MQTT broker.
+
+## Dependencies
+
+- tokio (with full features)
+- rumqttc
+- serde
+- serde_json
+
+## Usage
+
+```bash
+cargo run
+```
+
+## Configuration
+
+Edit `src/main.rs` to customize:
+- Broker address (default: `localhost:1883`)
+- MQTT topic (default: `test/topic`)
+- Message payload
+
+## Example
+
+```rust
+client.publish("your/topic", QoS::AtLeastOnce, false, b"Your message").await?;
+```