Hieromon Ikasamo
6 years ago
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/*
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ESP8266 publish the RSSI as the WiFi signal strength to ThingSpeak channel. |
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This example is for explaining how to use the AutoConnect library. |
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In order to execute this example, the ThingSpeak account is needed. Sing up |
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for New User Account and create a New Channel via My Channels. |
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For details, please refer to the project page. |
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https://hieromon.github.io/AutoConnect/examples/index.html#used-with-mqtt-as-a-client-application
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This example is based on the environment as of March 20, 2018. |
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Copyright (c) 2018 Hieromon Ikasamo. |
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This software is released under the MIT License. |
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https://opensource.org/licenses/MIT
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*/ |
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#include <ESP8266WiFi.h> |
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#include <PubSubClient.h> |
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#include <AutoConnect.h> |
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#define MQTT_USER_KEY "****************" // Replace to User API Key.
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#define CHANNEL_ID "******" // Replace to Channel ID.
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#define CHANNEL_API_KEY_WR "****************" // Replace to the write API Key.
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#define MQTT_UPDATE_INTERVAL 40000 |
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#define MQTT_TOPIC "channels/" CHANNEL_ID "/publish/" CHANNEL_API_KEY_WR |
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#define MQTT_USER_ID "anyone" |
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#define MQTT_SERVER "mqtt.thingspeak.com" |
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AutoConnect portal; |
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WiFiClient wifiClient; |
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PubSubClient mqttClient(wifiClient); |
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bool mqttConnect() { |
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static const char alphanum[] = "0123456789" |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"abcdefghijklmnopqrstuvwxyz"; // For random generation of client ID.
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char clientId[9]; |
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uint8_t retry = 10; |
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while (!mqttClient.connected()) { |
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Serial.println("Attempting MQTT broker:" MQTT_SERVER); |
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for (uint8_t i = 0; i < 8; i++) { |
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clientId[i] = alphanum[random(62)]; |
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} |
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clientId[8] = '\0'; |
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if (mqttClient.connect(clientId, MQTT_USER_ID, MQTT_USER_KEY)) { |
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Serial.println("Established:" + String(clientId)); |
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return true; |
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} else { |
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Serial.println("Connection failed:" + String(mqttClient.state())); |
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if (!--retry) |
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return false; |
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} |
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delay(3000); |
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} |
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} |
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void mqttPublish(String msg) { |
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String path = String(MQTT_TOPIC); |
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int tLen = path.length(); |
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char topic[tLen]; |
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path.toCharArray(topic, tLen + 1); |
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int mLen = msg.length(); |
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char payload[mLen]; |
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msg.toCharArray(payload, mLen + 1); |
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mqttClient.publish(topic, payload); |
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} |
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unsigned long lastPub = 0; |
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void setup() { |
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delay(1000); |
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Serial.begin(115200); |
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Serial.println(); |
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Serial.print("WiFi "); |
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if (portal.begin()) { |
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Serial.println("connected:" + WiFi.SSID()); |
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Serial.println("IP:" + WiFi.localIP().toString()); |
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} else { |
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Serial.println("connection failed:" + String(WiFi.status())); |
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while (1) { |
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delay(100); |
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yield(); |
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} |
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} |
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mqttClient.setServer(MQTT_SERVER, 1883); |
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} |
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void loop() { |
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if (millis() - lastPub > MQTT_UPDATE_INTERVAL) { |
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if (!mqttClient.connected()) { |
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mqttConnect(); |
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} |
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String item = String("field1=") + String(WiFi.RSSI()); |
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mqttPublish(item); |
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mqttClient.loop(); |
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lastPub = millis(); |
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} |
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portal.handleClient(); |
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} |
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After Width: | Height: | Size: 106 KiB |
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After Width: | Height: | Size: 83 KiB |
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After Width: | Height: | Size: 62 KiB |
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After Width: | Height: | Size: 110 KiB |
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After Width: | Height: | Size: 93 KiB |
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After Width: | Height: | Size: 25 KiB |
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After Width: | Height: | Size: 11 KiB |
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After Width: | Height: | Size: 28 KiB |
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After Width: | Height: | Size: 17 KiB |