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use super::{BridgeConfig, ConnectError};
use certificate::parse_root_certificate::*;
use rumqttc::{self, Client, Event, Incoming, MqttOptions, Outgoing, Packet, QoS, Transport};
// Connect directly to the c8y cloud over mqtt and publish device create message.
pub fn create_device_with_direct_connection(
bridge_config: &BridgeConfig,
device_type: &str,
) -> Result<(), ConnectError> {
const DEVICE_ALREADY_EXISTS: &[u8] = b"41,100,Device already existing";
const DEVICE_CREATE_ERROR_TOPIC: &str = "s/e";
let address = bridge_config.address.clone();
let host: Vec<&str> = address.split(':').collect();
let mut mqtt_options = MqttOptions::new(bridge_config.remote_clientid.clone(), host[0], 8883);
mqtt_options.set_keep_alive(std::time::Duration::from_secs(5));
let mut tls_config = create_tls_config();
load_root_certs(
&mut tls_config.root_store,
bridge_config.bridge_root_cert_path.clone().into(),
)?;
let pvt_key = read_pvt_key(bridge_config.bridge_keyfile.clone().into())?;
let cert_chain = read_cert_chain(bridge_config.bridge_certfile.clone().into())?;
let _ = tls_config.set_single_client_cert(cert_chain, pvt_key);
mqtt_options.set_transport(Transport::tls_with_config(tls_config.into()));
let (mut client, mut connection) = Client::new(mqtt_options, 10);
client.subscribe(DEVICE_CREATE_ERROR_TOPIC, QoS::AtLeastOnce)?;
let mut device_create_try: usize = 0;
for event in connection.iter() {
match event {
Ok(Event::Incoming(Packet::SubAck(_))) => {
publish_device_create_message(
&mut client,
&bridge_config.remote_clientid.clone(),
device_type,
)?;
}
Ok(Event::Incoming(Packet::Publish(response))) => {
// We got a response
if response.payload == DEVICE_ALREADY_EXISTS {
return Ok(());
}
}
Ok(Event::Outgoing(Outgoing::PingReq)) => {
// If not received any response then resend the device create request again.
// else timeout.
if device_create_try < 1 {
publish_device_create_message(
&mut client,
&bridge_config.remote_clientid.clone(),
device_type,
)?;
device_create_try += 1;
} else {
// No messages have been received for a while
break;
}
}
Ok(Event::Incoming(Incoming::Disconnect)) => {
eprintln!("ERROR: Disconnected");
break;
}
Err(err) => {
eprintln!("ERROR: {:?}", err);
return Err(ConnectError::ConnectionCheckError);
}
_ => {}
}
}
// The request has not even been sent
println!("No response from Cumulocity");
Err(ConnectError::TimeoutElapsedError)
}
fn publish_device_create_message(
client: &mut Client,
device_id: &str,
device_type: &str,
) -> Result<(), ConnectError> {
const DEVICE_CREATE_PUBLISH_TOPIC: &str = "s/us";
client.publish(
DEVICE_CREATE_PUBLISH_TOPIC,
QoS::ExactlyOnce,
false,
format!("100,{},{}", device_id, device_type).as_bytes(),
)?;
Ok(())
}
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