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main.go
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main.go
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// Copyright 2019 The mqtt-go authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"crypto/tls"
"fmt"
"os"
"time"
"github.com/at-wat/mqtt-go"
)
func main() {
if len(os.Args) < 2 {
fmt.Printf("usage: %s server-host.domain\n", os.Args[0])
os.Exit(1)
}
host := os.Args[1]
ctx, cancel := context.WithTimeout(context.Background(), 600*time.Second)
defer cancel()
println("Connecting to", host)
cli, err := mqtt.NewReconnectClient(
// Dialer to connect/reconnect to the server.
mqtt.DialerFunc(func(ctx context.Context) (*mqtt.BaseClient, error) {
// Presign URL here.
url := fmt.Sprintf("wss://%s:9443?token=%x",
host, time.Now().UnixNano(),
)
println("New URL:", url)
return mqtt.DialContext(ctx, url,
mqtt.WithTLSConfig(&tls.Config{InsecureSkipVerify: true}),
mqtt.WithConnStateHandler(func(s mqtt.ConnState, err error) {
fmt.Printf("State changed to %s (err: %v)\n", s, err)
}),
)
}),
mqtt.WithPingInterval(10*time.Second),
mqtt.WithTimeout(5*time.Second),
mqtt.WithReconnectWait(1*time.Second, 15*time.Second),
)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
_, err = cli.Connect(ctx,
"sample", // Client ID
mqtt.WithKeepAlive(30),
)
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
mux := &mqtt.ServeMux{} // Multiplex message handlers by topic name.
cli.Handle(mux) // Register mux as a low-level handler.
mux.Handle("#", // Handle all topics by this handler.
mqtt.HandlerFunc(func(msg *mqtt.Message) {
fmt.Printf("Received (%s): %s (QoS: %d)\n",
msg.Topic, []byte(msg.Payload), int(msg.QoS),
)
cancel()
}),
)
if _, err := cli.Subscribe(ctx,
mqtt.Subscription{
Topic: "stop",
QoS: mqtt.QoS1,
},
); err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
println("Publishing one message to 'test' topic")
if err := cli.Publish(ctx, &mqtt.Message{
Topic: "test",
QoS: mqtt.QoS1,
Payload: []byte("{\"message\": \"Hello\"}"),
}); err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
println("Waiting message on 'stop' topic")
<-ctx.Done()
println("Disconnecting")
if err := cli.Disconnect(ctx); err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
}