Struct tether_agent::TetherAgent

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pub struct TetherAgent { /* private fields */ }

Implementations§

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impl TetherAgent

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pub fn is_connected(&self) -> bool

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pub fn description(&self) -> (&str, &str)

Returns the Agent Role and ID (group)

Examples found in repository?
examples/publish.rs (line 25)
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fn main() {
    println!("Rust Tether Agent publish example");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .build()
        .expect("failed to connect Tether");
    let (role, id) = agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        info!("#{i}: Sending custom struct message...");
        let custom_message = CustomStruct {
            id: i,
            name: "hello".into(),
        };
        agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}
More examples
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examples/username_password.rs (line 28)
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fn main() {
    println!("Rust Tether Agent: with username and password");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let tether_agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .host("10.112.10.10")
        .username("connected.space")
        .password("connected.space")
        .build()
        .expect("Failed to initialise and connect");
    let (role, id) = tether_agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&tether_agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&tether_agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&tether_agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        tether_agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        tether_agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        let custom_message = CustomStruct {
            foo: "hello".into(),
            bar: 0.42,
        };
        tether_agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}
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pub fn broker_uri(&self) -> &str

Return the URI (protocol, IP address, port, path) that was used to connect to the MQTT broker

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pub fn set_role(&mut self, role: &str)

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pub fn set_id(&mut self, id: &str)

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pub fn connect( &self, user: Option<String>, password: Option<String> ) -> Result<(), Error>

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pub fn check_messages(&self) -> Option<(String, Message)>

If a message is waiting return Plug Name, Message (String, Message)

Examples found in repository?
examples/subscribe_threaded.rs (line 58)
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fn main() {
    println!("Rust Tether Agent subscribe example");

    let tether_agent = Arc::new(Mutex::new(
        TetherAgentOptionsBuilder::new("RustDemoAgent")
            .id("example")
            .build()
            .expect("failed to init/connect"),
    ));

    match tether_agent.lock() {
        Ok(a) => {
            let _input_plug = PlugOptionsBuilder::create_output("one").build(&a);
        }
        Err(e) => {
            panic!("Failed to acquire lock for Tether Agent setup: {}", e);
        }
    };

    let (tx, rx) = mpsc::channel();

    let receiver_agent = Arc::clone(&tether_agent);
    thread::spawn(move || {
        println!("Checking messages every 1s, 10x...");

        let mut message_count = 0;
        let mut i = 0;

        loop {
            i += 1;
            // println!("#{i}: Checking messages...");
            match receiver_agent.try_lock() {
                Ok(a) => {
                    if let Some((topic, _message)) = a.check_messages() {
                        message_count += 1;
                        println!("<<<<<<<< CHECKING LOOP: Received a message on topic {topic}",);
                        tx.send(format!("received message #{message_count}"))
                            .expect("failed to send message via channel");
                    }
                }
                Err(e) => {
                    println!("Failed to acquire lock: {}", e);
                }
            }
            thread::sleep(Duration::from_millis(1));
        }
    });

    let mut main_thread_received_count = 0;

    loop {
        println!("Main thread sleep...");
        for rx in rx.try_iter() {
            main_thread_received_count += 1;
            println!(
                "<<<<<<<< MAIN THREAD: received {} (count: {})",
                rx, main_thread_received_count
            );
        }
        if main_thread_received_count >= 10 {
            println!("We're done!");
            std::process::exit(0);
        }
        std::thread::sleep(Duration::from_secs(1));
    }
}
More examples
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examples/subscribe.rs (line 40)
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fn main() {
    println!("Rust Tether Agent subscribe example");

    let mut builder = Builder::from_env(Env::default().default_filter_or("debug"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let tether_agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .id("example")
        .build()
        .expect("failed to init Tether agent");

    let input_one = PlugOptionsBuilder::create_input("one").build(&tether_agent);
    debug!("input one {} = {}", input_one.name(), input_one.topic());
    let input_two = PlugOptionsBuilder::create_input("two").build(&tether_agent);
    debug!("input two {} = {}", input_two.name(), input_two.topic());
    let input_empty = PlugOptionsBuilder::create_input("nothing").build(&tether_agent);

    info!("Checking messages every 1s, 10x...");

    for i in 1..10 {
        info!("#{i}: Checking for messages...");
        while let Some((plug_name, message)) = tether_agent.check_messages() {
            debug!(
                "Received a message topic {} => plug name {}",
                message.topic(),
                plug_name
            );
            if &plug_name == input_one.name() {
                info!(
                    "******** INPUT ONE:\n Received a message from plug named \"{}\" on topic {} with length {} bytes",
                    input_one.name(),
                    message.topic(),
                    message.payload().len()
                );
            }
            if &plug_name == input_two.name() {
                info!(
                    "******** INPUT TWO:\n Received a message from plug named \"{}\" on topic {} with length {} bytes",
                    input_two.name(),
                    message.topic(),
                    message.payload().len()
                );
                // Notice how you must give the from_slice function a type so it knows what to expect
                let decoded = from_slice::<CustomMessage>(&message.payload());
                match decoded {
                    Ok(d) => {
                        info!("Yes, we decoded the MessagePack payload as: {:?}", d);
                        let CustomMessage { name, id } = d;
                        debug!("Name is {} and ID is {}", name, id);
                    }
                    Err(e) => {
                        warn!("Failed to decode the payload: {}", e)
                    }
                };
            }
            if &plug_name == input_empty.name() {
                info!(
                    "******** EMPTY MESSAGE:\n Received a message from plug named \"{}\" on topic {} with length {} bytes",
                    input_empty.name(),
                    message.topic(),
                    message.payload().len()
                );
            }
        }
        thread::sleep(Duration::from_millis(1000))
    }
}
examples/subscribe_publish_threaded.rs (line 73)
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fn main() {
    let check_interval = 0.01;
    let publish_count_target = 100;
    let publish_interval = 0.1;

    println!("Rust Tether Agent threaded publish-while-consuming example");

    let tether_agent = Arc::new(Mutex::new(
        TetherAgentOptionsBuilder::new("RustDemoAgent")
            .id("example")
            .build()
            .expect("failed to init/connect"),
    ));

    println!("Set up tether agent OK");

    let mut output_plug = None;

    // Here we call .lock() because it is OK to block while "setting up", connecting
    if let Ok(a) = tether_agent.lock() {
        let _input_plug = PlugOptionsBuilder::create_input("one").build(&a);
        output_plug = Some(PlugOptionsBuilder::create_output("one").build(&a));
    } else {
        panic!("Error setting up Tether Agent!");
    }

    let receiver_agent = Arc::clone(&tether_agent);
    thread::spawn(move || {
        println!("Checking messages every {check_interval}s...");

        let mut i = 0;
        let mut count_messages_received = 0;

        /*
         Infinite loop. But because we never join the threads, this thread will terminate
         as soon as the main thread does.
        */
        loop {
            i += 1;
            println!("CHECKING LOOP: Checking messages attempt #{i}...");

            /*
              Here we call try_lock() because we do not want to block
              if the Agent is currently locked by another thread.
              Just print a message, wait and try again later.
            */
            match receiver_agent.try_lock() {
                Ok(a) => {
                    if let Some((topic, _message)) = a.check_messages() {
                        count_messages_received += 1;
                        println!("<<<<<<<< CHECKING LOOP: Received a message on topic {topic}; Now has {count_messages_received} messages");
                    }
                }
                Err(e) => {
                    println!("CHECKING LOOP: Failed to acquire lock: {}", e);
                }
            }
            thread::sleep(Duration::from_secs_f32(check_interval));
        }
    });

    let sending_agent = Arc::clone(&tether_agent);
    println!(
        "Sending a message, every {}s, exactly {}x times...",
        publish_interval, publish_count_target
    );
    let mut count_messages_sent = 0;
    for i in 1..=publish_count_target {
        println!("MAIN THREAD LOOP: Send attempt #{i}");
        /*
          In this particular case, lock() is preferable to try_lock() because
          we are not doing anything else on this thread. Waiting (blocking)
          to acquire the lock
          is fine; the other thread will let it go soon.
        */
        match sending_agent.lock() {
            Ok(a) => {
                count_messages_sent += 1;
                if let Some(plug) = &output_plug {
                    a.publish(plug, Some(&[0])).expect("Failed to publish");
                    println!(">>>>>>>> MAIN THREAD LOOP: sent {count_messages_sent} messages");
                }
            }
            Err(e) => {
                panic!("MAIN THREAD LOOP: Failed to acquire lock: {}", e);
            }
        }
        thread::sleep(Duration::from_secs_f32(publish_interval));
    }
}
source

pub fn publish( &self, plug_definition: &PlugDefinition, payload: Option<&[u8]> ) -> Result<(), ()>

Given a plug definition and a raw (u8 buffer) payload, generate a message on an appropriate topic and with the QOS specified in the Plug Definition

Examples found in repository?
examples/publish.rs (line 34)
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fn main() {
    println!("Rust Tether Agent publish example");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .build()
        .expect("failed to connect Tether");
    let (role, id) = agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        info!("#{i}: Sending custom struct message...");
        let custom_message = CustomStruct {
            id: i,
            name: "hello".into(),
        };
        agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}
More examples
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examples/username_password.rs (line 37)
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fn main() {
    println!("Rust Tether Agent: with username and password");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let tether_agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .host("10.112.10.10")
        .username("connected.space")
        .password("connected.space")
        .build()
        .expect("Failed to initialise and connect");
    let (role, id) = tether_agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&tether_agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&tether_agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&tether_agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        tether_agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        tether_agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        let custom_message = CustomStruct {
            foo: "hello".into(),
            bar: 0.42,
        };
        tether_agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}
examples/subscribe_publish_threaded.rs (line 104)
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fn main() {
    let check_interval = 0.01;
    let publish_count_target = 100;
    let publish_interval = 0.1;

    println!("Rust Tether Agent threaded publish-while-consuming example");

    let tether_agent = Arc::new(Mutex::new(
        TetherAgentOptionsBuilder::new("RustDemoAgent")
            .id("example")
            .build()
            .expect("failed to init/connect"),
    ));

    println!("Set up tether agent OK");

    let mut output_plug = None;

    // Here we call .lock() because it is OK to block while "setting up", connecting
    if let Ok(a) = tether_agent.lock() {
        let _input_plug = PlugOptionsBuilder::create_input("one").build(&a);
        output_plug = Some(PlugOptionsBuilder::create_output("one").build(&a));
    } else {
        panic!("Error setting up Tether Agent!");
    }

    let receiver_agent = Arc::clone(&tether_agent);
    thread::spawn(move || {
        println!("Checking messages every {check_interval}s...");

        let mut i = 0;
        let mut count_messages_received = 0;

        /*
         Infinite loop. But because we never join the threads, this thread will terminate
         as soon as the main thread does.
        */
        loop {
            i += 1;
            println!("CHECKING LOOP: Checking messages attempt #{i}...");

            /*
              Here we call try_lock() because we do not want to block
              if the Agent is currently locked by another thread.
              Just print a message, wait and try again later.
            */
            match receiver_agent.try_lock() {
                Ok(a) => {
                    if let Some((topic, _message)) = a.check_messages() {
                        count_messages_received += 1;
                        println!("<<<<<<<< CHECKING LOOP: Received a message on topic {topic}; Now has {count_messages_received} messages");
                    }
                }
                Err(e) => {
                    println!("CHECKING LOOP: Failed to acquire lock: {}", e);
                }
            }
            thread::sleep(Duration::from_secs_f32(check_interval));
        }
    });

    let sending_agent = Arc::clone(&tether_agent);
    println!(
        "Sending a message, every {}s, exactly {}x times...",
        publish_interval, publish_count_target
    );
    let mut count_messages_sent = 0;
    for i in 1..=publish_count_target {
        println!("MAIN THREAD LOOP: Send attempt #{i}");
        /*
          In this particular case, lock() is preferable to try_lock() because
          we are not doing anything else on this thread. Waiting (blocking)
          to acquire the lock
          is fine; the other thread will let it go soon.
        */
        match sending_agent.lock() {
            Ok(a) => {
                count_messages_sent += 1;
                if let Some(plug) = &output_plug {
                    a.publish(plug, Some(&[0])).expect("Failed to publish");
                    println!(">>>>>>>> MAIN THREAD LOOP: sent {count_messages_sent} messages");
                }
            }
            Err(e) => {
                panic!("MAIN THREAD LOOP: Failed to acquire lock: {}", e);
            }
        }
        thread::sleep(Duration::from_secs_f32(publish_interval));
    }
}
source

pub fn encode_and_publish<T: Serialize>( &self, plug_definition: &PlugDefinition, data: T ) -> Result<(), ()>

Similar to publish but serializes the data automatically before sending

Examples found in repository?
examples/publish.rs (line 48)
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fn main() {
    println!("Rust Tether Agent publish example");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .build()
        .expect("failed to connect Tether");
    let (role, id) = agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        info!("#{i}: Sending custom struct message...");
        let custom_message = CustomStruct {
            id: i,
            name: "hello".into(),
        };
        agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}
More examples
Hide additional examples
examples/username_password.rs (line 50)
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fn main() {
    println!("Rust Tether Agent: with username and password");

    let mut builder = Builder::from_env(Env::default().default_filter_or("info"));
    builder.init();

    debug!("Debugging is enabled; could be verbose");

    let tether_agent = TetherAgentOptionsBuilder::new("RustDemoAgent")
        .host("10.112.10.10")
        .username("connected.space")
        .password("connected.space")
        .build()
        .expect("Failed to initialise and connect");
    let (role, id) = tether_agent.description();
    info!("Created agent OK: {}, {}", role, id);

    let empty_message_output = PlugOptionsBuilder::create_output("nothing").build(&tether_agent);
    let boolean_message_output = PlugOptionsBuilder::create_output("one").build(&tether_agent);
    let custom_output = PlugOptionsBuilder::create_output("two").build(&tether_agent);

    for i in 1..=10 {
        info!("#{i}: Sending empty message...");
        tether_agent.publish(&empty_message_output, None).unwrap();

        let bool = i % 2 == 0;
        info!("#{i}: Sending boolean message...");
        tether_agent
            .publish(&boolean_message_output, Some(&[bool.into()]))
            .unwrap();

        let custom_message = CustomStruct {
            foo: "hello".into(),
            bar: 0.42,
        };
        tether_agent
            .encode_and_publish(&custom_output, custom_message)
            .unwrap();

        thread::sleep(Duration::from_millis(1000))
    }
}

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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.