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https://github.com/tinygo-org/drivers.git
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sago35
143 lines
3.1 KiB
Go
143 lines
3.1 KiB
Go
// This is a sensor station that uses a ESP8266 or ESP32 running on the device UART1.
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// It creates an MQTT connection that publishes a message every second
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// to an MQTT broker.
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//
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// In other words:
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// Your computer <--> UART0 <--> MCU <--> UART1 <--> ESP8266 <--> Internet <--> MQTT broker.
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//
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// You must install the Paho MQTT package to build this program:
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//
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// go get -u github.com/eclipse/paho.mqtt.golang
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//
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package main
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import (
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"machine"
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"math/rand"
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"time"
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"tinygo.org/x/drivers/espat"
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"tinygo.org/x/drivers/net/mqtt"
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)
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// access point info
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const ssid = "YOURSSID"
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const pass = "YOURPASS"
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// IP address of the MQTT broker to use. Replace with your own info.
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const server = "tcp://test.mosquitto.org:1883"
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//const server = "ssl://test.mosquitto.org:8883"
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// these are the default pins for the Arduino Nano33 IoT.
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// change these to connect to a different UART or pins for the ESP8266/ESP32
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var (
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uart = machine.UART2
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tx = machine.PA22
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rx = machine.PA23
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console = machine.Serial
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adaptor *espat.Device
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topic = "tinygo"
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)
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func main() {
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time.Sleep(3000 * time.Millisecond)
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uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
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rand.Seed(time.Now().UnixNano())
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// Init esp8266/esp32
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adaptor = espat.New(uart)
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adaptor.Configure()
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// first check if connected
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if connectToESP() {
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println("Connected to wifi adaptor.")
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adaptor.Echo(false)
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connectToAP()
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} else {
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println("")
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failMessage("Unable to connect to wifi adaptor.")
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return
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}
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opts := mqtt.NewClientOptions()
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opts.AddBroker(server).SetClientID("tinygo-client-" + randomString(10))
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println("Connecting to MQTT broker at", server)
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cl := mqtt.NewClient(opts)
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if token := cl.Connect(); token.Wait() && token.Error() != nil {
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failMessage(token.Error().Error())
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}
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for {
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println("Publishing MQTT message...")
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data := []byte("{\"e\":[{ \"n\":\"hello\", \"v\":101 }]}")
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token := cl.Publish(topic, 0, false, data)
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token.Wait()
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if token.Error() != nil {
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println(token.Error().Error())
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}
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time.Sleep(1000 * time.Millisecond)
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}
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// Right now this code is never reached. Need a way to trigger it...
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println("Disconnecting MQTT...")
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cl.Disconnect(100)
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println("Done.")
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}
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// connect to ESP8266/ESP32
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func connectToESP() bool {
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for i := 0; i < 5; i++ {
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println("Connecting to wifi adaptor...")
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if adaptor.Connected() {
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return true
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}
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time.Sleep(1 * time.Second)
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}
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return false
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}
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// connect to access point
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func connectToAP() {
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println("Connecting to wifi network '" + ssid + "'")
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adaptor.SetWifiMode(espat.WifiModeClient)
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adaptor.ConnectToAP(ssid, pass, 10)
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println("Connected.")
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ip, err := adaptor.GetClientIP()
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if err != nil {
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failMessage(err.Error())
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}
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println(ip)
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}
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// Returns an int >= min, < max
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func randomInt(min, max int) int {
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return min + rand.Intn(max-min)
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}
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// Generate a random string of A-Z chars with len = l
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func randomString(len int) string {
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bytes := make([]byte, len)
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for i := 0; i < len; i++ {
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bytes[i] = byte(randomInt(65, 90))
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}
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return string(bytes)
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}
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func failMessage(msg string) {
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for {
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println(msg)
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time.Sleep(1 * time.Second)
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}
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}
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