Hacked MQTT output without panel

Create MQTT.md with protocol overview and usage examples.

Update client/bin/src/main.rs to initialize a Paho MQTT client with environment-configured broker, connect, and publish combined weather and transit data to the ledboard/data topic.

client/MQTT.md

@@ -0,0 +1,51 @@
+ # MQTT Configuration
+
+ This project can publish weather and public transport data to an MQTT broker.
+ To enable MQTT, follow these steps:
+
+ ## 1. Install dependencies
+ Ensure you have Rust and Cargo installed. The MQTT support uses the Paho MQTT client crate.
+ Run:
+ ```bash
+ cargo update
+ ```
+
+ ## 2. Set the MQTT_BROKER environment variable
+ Before running the client, define `MQTT_BROKER` to your broker address.
+ - Without URI scheme (defaults to TCP):
+   ```bash
+   export MQTT_BROKER=localhost:1883
+   ```
+ - With URI scheme:
+   ```bash
+   export MQTT_BROKER=tcp://broker.example.com:1883
+   ```
+
+ ## 3. Run the LED board client
+ Pass the LED board IP address as the only argument:
+ ```bash
+ export MQTT_BROKER=localhost:1883
+ cargo run --bin ledboard_client -- 192.168.1.50
+ ```
+
+ ## Topics and Payloads
+ The client publishes two topics:
+
+ ### weather
+ JSON payload with fields:
+ - `dt`: timestamp (Unix seconds)
+ - `temp`: temperature in °C
+ - `weather`: object with `main`, `description`, `icon`
+ - `rain`: rain volume in last 3h (optional)
+ - `pop`: probability of precipitation
+ - `wind`: object with `speed`, `deg`, `gust`
+
+ ### straba
+ JSON payload with fields:
+ - `outbound_station`: name of outbound station
+ - `outbound_diff`: seconds until outbound departure
+ - `inbound_station`: name of inbound station
+ - `inbound_diff`: seconds until inbound departure
+
+ ## Customization
+ You can adjust MQTT topics, QoS, and message formats in `client/bin/src/main.rs` under the `publish_to_mqtt` function.

client/bin/Cargo.toml

@@ -21,4 +21,5 @@ serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 # end of web stuff
+paho-mqtt = "0.13.2"
 ping = "0.4.1"

client/bin/src/main.rs

@@ -23,6 +23,7 @@ use std::process::ExitCode;
 
 use openweathermap::forecast::Forecast;
 use straba::NextDeparture;
+use paho_mqtt::{Client, CreateOptionsBuilder, ConnectOptionsBuilder, Message};
 // This declaration will look for a file named `straba.rs` and will
 // insert its contents inside a module named `straba` under this scope
 mod straba;
@@ -302,12 +303,11 @@ fn send_package(ipaddress: String,
 
     render_clock(&mut display);
 
-
     package[1..PACKAGE_LENGTH].copy_from_slice(&display.image);
-    // client need to bind to client port (1 before 4242)
+    let target = format!("{}:4242", ipaddress);
-    let socket = UdpSocket::bind("0.0.0.0:14242").expect("couldn't bind to address");
+    let socket = UdpSocket::bind("0.0.0.0:0").expect("couldn't bind to address");
     socket
-        .send_to(&package, ipaddress + ":4242")
+        .send_to(&package, &target)
         .expect("couldn't send data");
 }
 
@@ -322,30 +322,56 @@ LEDboardClient <ip address>"
 
 fn check_connection(ipaddress: String) -> bool {
     let device_online;
-    // generate a faulty package length
     let mut package: [u8; PACKAGE_LENGTH/2] = [0; PACKAGE_LENGTH/2];
-    // client need to bind to client port (1 before 4242)
-    let socket = UdpSocket::bind("0.0.0.0:14242").expect("couldn't bind to address");
-    socket.set_read_timeout(Some(Duration::from_secs(10))).unwrap(); /* 10 seconds timeout */
-    socket
-        .send_to(&package, ipaddress + ":4242")
-        .expect("couldn't send data");
     
-    // self.recv_buff is a [u8; 8092]
+    // Use a random local port instead of hardcoding
-    let answer = socket.recv_from(&mut package);
+    let socket = UdpSocket::bind("0.0.0.0:0").expect("couldn't bind to address");
-    match answer {
+    socket.set_read_timeout(Some(Duration::from_secs(10))).unwrap();
-        Ok((_n, _addr)) => {
+    
-            //println!("{} bytes response from {:?} {:?}", n, addr, &package[..n]);
+    let target = format!("{}:4242", ipaddress);
-            device_online = true;
+    match socket.send_to(&package, &target) {
-        }
+        Ok(_) => {
-        Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
+            // Continue with receive
-            device_online = false;
+            match socket.recv_from(&mut package) {
-        }
+                Ok((_n, _addr)) => device_online = true,
-        Err(_e) => {
+                Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => device_online = false,
-            device_online = false;
+                Err(_) => device_online = false,
-        }
+            }
+        },
+        Err(_) => device_online = false,
+    }
+    
+    device_online
+}
+/// Publishes weather and transit data to MQTT broker
+fn publish_to_mqtt(client: &Client, data: &Option<Result<Forecast, String>>, straba_res: &NextDeparture) {
+    let payload = if let Some(Ok(forecast)) = data {
+        if let Some(f) = forecast.list.first() {
+            let temp = f.main.temp;
+            let weather = f.weather.get(0).map(|w| w.main.clone()).unwrap_or_default();
+            format!("temp:{:.1}C,weather:{}",
+                temp,
+                weather)
+       } else {
+            "no_forecast".to_string()
+        }
+    } else {
+        "no_data".to_string()
+    };
+    let msg = Message::new("ledboard/forecast", payload, 1);
+    if let Err(e) = client.publish(msg) {
+        eprintln!("Error publishing MQTT message: {}", e);
+    }
+
+    let payloadPT = {
+            format!("out:{}min,in:{}min",
+                straba_res.outbound_diff / 60,
+                straba_res.inbound_diff / 60)
+    };
+    let ptmsg = Message::new("ledboard/public_transportation", payloadPT, 1);
+    if let Err(e) = client.publish(ptmsg) {
+        eprintln!("Error publishing MQTT message: {}", e);
     }
-    return device_online;
 }
 
 fn main() -> ExitCode {
@@ -365,9 +391,11 @@ fn main() -> ExitCode {
             let mut device_online = check_connection(ip.to_string());
             if !device_online {
                 println!("{} not online", ip);
-                return ExitCode::FAILURE;
+               // return ExitCode::FAILURE;
             }
 
+            
+
             let receiver = openweathermap::init_forecast("Mannheim",
             "metric",
             "de",
@@ -381,6 +409,45 @@ fn main() -> ExitCode {
             println!("{:?} {:?}s", straba_res.outbound_station, straba_res.outbound_diff);
             println!("{:?} {:?}s", straba_res.inbound_station , straba_res.inbound_diff);
 
+            // Initialize MQTT client from MQTT_BROKER env var (else disabled)
+            let mqtt_client: Option<Client> = {
+                // Read broker URL from environment
+                let broker = match std::env::var("MQTT_BROKER") {
+                    Ok(val) if !val.is_empty() => val,
+                    _ => {
+                        eprintln!("Environment variable MQTT_BROKER not set or empty, MQTT disabled");
+                        String::new()
+                    }
+                };
+                if broker.is_empty() {
+                    None
+                } else {
+                    let create_opts = CreateOptionsBuilder::new()
+                        .server_uri(&broker)
+                        .client_id("ledboard_client")
+                        .finalize();
+                    match Client::new(create_opts) {
+                        Ok(cli) => {
+                            let conn_opts = ConnectOptionsBuilder::new()
+                                .keep_alive_interval(Duration::from_secs(20))
+                                .clean_session(true)
+                                .finalize();
+                            match cli.connect(conn_opts) {
+                                Ok(_) => Some(cli),
+                                Err(e) => {
+                                    eprintln!("Failed to connect to MQTT broker '{}': {}", broker, e);
+                                    None
+                                }
+                            }
+                        }
+                        Err(e) => {
+                            eprintln!("Failed to create MQTT client for '{}': {}", broker, e);
+                            None
+                        }
+                    }
+                }
+            };
+
             // Render start
             send_package(ip.to_string(), &last_data, &straba_res);
             loop {
@@ -414,7 +481,12 @@ fn main() -> ExitCode {
                 if device_online == true {
                     // Render new image
                     send_package(ip.to_string(), &last_data, &straba_res);
-                }
+                    // Publish data to MQTT
+               }
+                 if let Some(ref client) = mqtt_client {
+                        publish_to_mqtt(client, &last_data, &straba_res);
+                    }
+
             }
         }
         // all the other cases