// Copyright 2021-2022 EMQ Technologies Co., Ltd. // // 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 ( "fmt" mqtt "github.com/eclipse/paho.mqtt.golang" "time" ) const ( tps = 500 ) func pub() { opts := mqtt.NewClientOptions().AddBroker(mqttUrl) client := mqtt.NewClient(opts) defer client.Disconnect(0) if token := client.Connect(); token.Wait() && token.Error() != nil { panic(token.Error()) } for i := 0; ; i++ { payload := []byte(fmt.Sprintf(`{"temperature":%d,"humidity":90}`, 12+i%10)) if token := client.Publish("rawdata", 0, false, payload); token.Wait() && token.Error() != nil { fmt.Println(token.Error()) } time.Sleep(1000 / tps * time.Millisecond) } }