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263 lines
8.3 KiB
263 lines
8.3 KiB
/*
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ESP8266/ESP32 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/howtoembed.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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#if defined(ARDUINO_ARCH_ESP8266)
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#include <ESP8266WiFi.h>
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#include <ESP8266HTTPClient.h>
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#define GET_CHIPID() (ESP.getChipId())
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#elif defined(ARDUINO_ARCH_ESP32)
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#include <WiFi.h>
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#include <SPIFFS.h>
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#include <HTTPClient.h>
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#define GET_CHIPID() ((uint16_t)(ESP.getEfuseMac()>>32))
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#endif
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#include <FS.h>
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#include <PubSubClient.h>
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#include <AutoConnect.h>
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#define PARAM_FILE "/param.json"
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#define AUX_SETTING_URI "/mqtt_setting"
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#define AUX_SAVE_URI "/mqtt_save"
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#define AUX_CLEAR_URI "/mqtt_clear"
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// Adjusting WebServer class with between ESP8266 and ESP32.
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#if defined(ARDUINO_ARCH_ESP8266)
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typedef ESP8266WebServer WiFiWebServer;
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#elif defined(ARDUINO_ARCH_ESP32)
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typedef WebServer WiFiWebServer;
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#endif
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// This example shows a sketch that realizes the equivalent operation
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// of mqttRSSI without using JSON.
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// By comparing this example with the example using JSON, mqttRSSI or
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// mqttRSSI_FS, you will better understand AutoConnect's custom Web page
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// facility.
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// Declare AutoConnectElements for the page asf /mqtt_setting
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ACStyle(style, "label+input,label+select{position:sticky;left:120px;width:230px!important;box-sizing:border-box;}");
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ACText(header, "<h2>MQTT broker settings</h2>", "text-align:center;color:#2f4f4f;padding:10px;");
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ACText(caption, "Publishing the WiFi signal strength to MQTT channel. RSSI value of ESP8266 to the channel created on ThingSpeak", "font-family:serif;color:#4682b4;");
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ACInput(mqttserver, "", "Server", "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$", "MQTT broker server");
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ACInput(channelid, "", "Channel ID", "^[0-9]{6}$");
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ACInput(userkey, "", "User Key");
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ACInput(apikey, "", "API Key");
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ACElement(newline, "<hr>");
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ACCheckbox(uniqueid, "unique", "Use APID unique");
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ACRadio(period, { "30 sec.", "60 sec.", "180 sec." }, "Update period", AC_Vertical, 1);
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ACSubmit(save, "Start", AUX_SAVE_URI);
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ACSubmit(discard, "Discard", "/");
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// Declare the custom Web page as /mqtt_setting and contains the AutoConnectElements
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AutoConnectAux mqtt_setting(AUX_SETTING_URI, "MQTT Setting", true, {
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style,
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header,
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caption,
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mqttserver,
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channelid,
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userkey,
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apikey,
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newline,
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uniqueid,
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period,
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newline,
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save,
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discard
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});
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// Declare AutoConnectElements for the page as /mqtt_save
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ACText(caption2, "<h4>Parameters available as:</h4>", "text-align:center;color:#2f4f4f;padding:10px;");
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ACText(parameters);
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ACSubmit(clear, "Clear channel", AUX_CLEAR_URI);
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// Declare the custom Web page as /mqtt_save and contains the AutoConnectElements
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AutoConnectAux mqtt_save(AUX_SAVE_URI, "MQTT Setting", false, {
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caption2,
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parameters,
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clear
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});
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AutoConnect portal;
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AutoConnectConfig config;
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WiFiClient wifiClient;
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PubSubClient mqttClient(wifiClient);
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unsigned int updateInterval = 0;
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unsigned long lastPub = 0;
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#define MQTT_USER_ID "anyone"
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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 = 3;
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while (!mqttClient.connected()) {
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if (mqttserver.value.length() <= 0)
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break;
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mqttClient.setServer(mqttserver.value.c_str(), 1883);
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Serial.println(String("Attempting MQTT broker:") + mqttserver.value);
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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, userkey.value.c_str())) {
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Serial.println("Established:" + String(clientId));
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return true;
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}
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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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break;
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delay(3000);
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}
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}
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return false;
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}
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void mqttPublish(String msg) {
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String path = String("channels/") + channelid.value + String("/publish/") + apikey.value;
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mqttClient.publish(path.c_str(), msg.c_str());
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}
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int getStrength(uint8_t points) {
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uint8_t sc = points;
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long rssi = 0;
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while (sc--) {
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rssi += WiFi.RSSI();
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delay(20);
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}
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return points ? static_cast<int>(rssi / points) : 0;
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}
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// Retreive the value of each element entered by '/mqtt_setting'.
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String saveParams(AutoConnectAux& aux, PageArgument& args) {
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mqttserver.value.trim();
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channelid.value.trim();
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userkey.value.trim();
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apikey.value.trim();
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updateInterval = period.value().substring(0, 2).toInt() * 1000;
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// Echo back saved parameters to AutoConnectAux page.
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String echo = "Server: " + mqttserver.value + "<br>";
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echo += "Channel ID: " + channelid.value + "<br>";
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echo += "User Key: " + userkey.value + "<br>";
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echo += "API Key: " + apikey.value + "<br>";
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echo += "Update period: " + String(updateInterval / 1000) + " sec.<br>";
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echo += "Use APID unique: " + String(uniqueid.checked == true ? "true" : "false") + "<br>";
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parameters.value = echo;
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return String("");
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}
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void handleRoot() {
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String content =
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"<html>"
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"<head>"
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"<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">"
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"</head>"
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"<body>"
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"<iframe width=\"450\" height=\"260\" style=\"transform:scale(0.79);-o-transform:scale(0.79);-webkit-transform:scale(0.79);-moz-transform:scale(0.79);-ms-transform:scale(0.79);transform-origin:0 0;-o-transform-origin:0 0;-webkit-transform-origin:0 0;-moz-transform-origin:0 0;-ms-transform-origin:0 0;border: 1px solid #cccccc;\" src=\"https://thingspeak.com/channels/454951/charts/1?bgcolor=%23ffffff&color=%23d62020&dynamic=true&type=line\"></iframe>"
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"<p style=\"padding-top:5px;text-align:center\">" AUTOCONNECT_LINK(COG_24) "</p>"
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"</body>"
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"</html>";
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WiFiWebServer& webServer = portal.host();
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webServer.send(200, "text/html", content);
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}
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// Clear channel using ThingSpeak's API.
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void handleClearChannel() {
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HTTPClient httpClient;
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WiFiClient client;
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String endpoint = mqttserver.value;
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endpoint.replace("mqtt", "api");
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String delUrl = "http://" + endpoint + "/channels/" + channelid.value + "/feeds.json?api_key=" + userkey.value;
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Serial.print("DELETE " + delUrl);
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if (httpClient.begin(client, delUrl)) {
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Serial.print(":");
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int resCode = httpClient.sendRequest("DELETE");
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String res = httpClient.getString();
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httpClient.end();
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Serial.println(String(resCode) + "," + res);
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}
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else
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Serial.println(" failed");
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// Returns the redirect response.
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WiFiWebServer& webServer = portal.host();
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webServer.sendHeader("Location", String("http://") + webServer.client().localIP().toString() + String("/"));
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webServer.send(302, "text/plain", "");
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webServer.client().flush();
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webServer.client().stop();
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}
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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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SPIFFS.begin();
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if (uniqueid.checked) {
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config.apid = String("ESP") + "-" + String(GET_CHIPID(), HEX);
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Serial.println("apid set to " + config.apid);
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}
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config.homeUri = "/";
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portal.config(config);
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// Join the custom Web pages and register /mqtt_save handler
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portal.join({ mqtt_setting, mqtt_save });
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portal.on(AUX_SAVE_URI, saveParams);
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Serial.print("WiFi ");
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if (portal.begin()) {
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config.bootUri = AC_ONBOOTURI_HOME;
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Serial.println("connected:" + WiFi.SSID());
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Serial.println("IP:" + WiFi.localIP().toString());
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}
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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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WiFiWebServer& webServer = portal.host();
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webServer.on("/", handleRoot);
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webServer.on(AUX_CLEAR_URI, handleClearChannel);
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}
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void loop() {
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portal.handleClient();
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if (updateInterval > 0) {
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if (millis() - lastPub > updateInterval) {
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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(getStrength(7));
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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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}
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}
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