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mqtt-wrapper.cpp
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mqtt-wrapper.cpp
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/*
* esp mqtt
* Based on exmaple code from github.com/knolleary/pubsubclient
* Copyright (c) 2016-2017 Mark Furland <mtfurlan@i3detroit.org>
* MIT licence
*/
#include "mqtt-wrapper.h"
#include <PubSubClient.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ArduinoOTA.h>
ESP8266WiFiMulti wifiMulti;
WiFiClient espClient;
PubSubClient client(espClient);
struct mqtt_wrapper_options* options;
enum ConnState state;
uint32_t nextTelemetry;
uint32_t telemetryInterval;
char ip[16];
char mqtt_wrapper_buf[128];
char mqtt_wrapper_topic[64];
unsigned char macBin[6];
char mac[18];
//Time since last mqtt connection attempt
uint32_t lastReconnectAttempt = 0;
void info2() {
sprintf(mqtt_wrapper_buf, "{\"Hostname\":\"%s\",\"IPaddress\":\"%s\",\"Mac\":\"%s\"}", options->host_name, ip, mac);
sprintf(mqtt_wrapper_topic, "tele/%s/INFO2", options->fullTopic);
client.publish(mqtt_wrapper_topic, mqtt_wrapper_buf);
}
boolean reconnect() {
if(wifiMulti.run() != WL_CONNECTED) {
if(state != WIFI_DISCONNECTED) {
state = WIFI_DISCONNECTED;
if(options->connectionEvent) {
options->connectionEvent(&client, state, 0);
}
}
//Wifi is disconnected
if(options->debug_print) Serial.print(".");
} else {
//We have wifi
if(state != F_MQTT_DISCONNECTED) {
state = F_MQTT_DISCONNECTED;
if(options->connectionEvent) {
options->connectionEvent(&client, state, 0);
}
}
if(options->debug_print) Serial.println("WiFi connected");
if(options->debug_print) Serial.println("IP address: ");
if(options->debug_print) Serial.println(WiFi.localIP());
int i = 0;
if (!client.connected()) {
if(options->debug_print) Serial.print("Attempting MQTT connection...");
// Attempt to connect
// client.connect(mqtt node name)
sprintf(mqtt_wrapper_buf, "tele/%s/LWT", options->fullTopic);
if (client.connect(options->host_name, mqtt_wrapper_buf, 0, true, "Offline")) {
if(state != F_MQTT_CONNECTED) {
state = F_MQTT_CONNECTED;
if(options->connectionEvent) {
options->connectionEvent(&client, state, 0);
}
}
if(options->debug_print) Serial.println("connected");
WiFi.localIP().toString().toCharArray(ip, sizeof(ip));
info2();
sprintf(mqtt_wrapper_topic, "tele/%s/LWT", options->fullTopic);
client.publish(mqtt_wrapper_topic, "Online", true);
sprintf(mqtt_wrapper_topic, "cmnd/%s/+", options->fullTopic);
client.subscribe(mqtt_wrapper_topic);
options->connectSuccess(&client, ip);
} else {
if(state != F_MQTT_DISCONNECTED) {
state = F_MQTT_DISCONNECTED;
if(options->connectionEvent) {
options->connectionEvent(&client, state, client.state());
}
}
// https://pubsubclient.knolleary.net/api.html#state
// int - the client state, which can take the following values (constants defined in PubSubClient.h):
// -4 : MQTT_CONNECTION_TIMEOUT - the server didn't respond within the keepalive time
// -3 : MQTT_CONNECTION_LOST - the network connection was broken
// -2 : MQTT_CONNECT_FAILED - the network connection failed
// -1 : MQTT_DISCONNECTED - the client is disconnected cleanly
// 0 : MQTT_CONNECTED - the client is connected
// 1 : MQTT_CONNECT_BAD_PROTOCOL - the server doesn't support the requested version of MQTT
// 2 : MQTT_CONNECT_BAD_CLIENT_ID - the server rejected the client identifier
// 3 : MQTT_CONNECT_UNAVAILABLE - the server was unable to accept the connection
// 4 : MQTT_CONNECT_BAD_CREDENTIALS - the username/password were rejected
// 5 : MQTT_CONNECT_UNAUTHORIZED - the client was not authorized to connect
if(options->debug_print) Serial.print("failed, rc=");
if(options->debug_print) Serial.println(client.state());
}
}
}
return client.connected();
}
void internal_callback(char* topic, byte* payload, unsigned int length) {
if(options->debug_print) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
// if it is addressed as a command to the fulltopic, parse it
sprintf(mqtt_wrapper_buf, "cmnd/%s/", options->fullTopic);
if(strncmp(mqtt_wrapper_buf, topic, strlen(mqtt_wrapper_buf)) == 0) {
//Find last bit of topic
int i = strlen(topic);
while(topic[i] != '/') {
// to lower
// https://stackoverflow.com/a/2661917/2423187
topic[i] = (topic[i] > 0x40 && topic[i] < 0x5b) ? topic[i]|0x60 : topic[i];
--i;
}
topic += i + 1;
//Handle some commands, return from function if handled
if(strcmp(topic, "restart") == 0) {
if(payload[0] == '1' && length == 1) {
if(options->debug_print) Serial.print("RESTART!");
sprintf(mqtt_wrapper_topic, "stat/%s/RESULT", options->fullTopic);
client.publish(mqtt_wrapper_topic, "{\"Restart\":\"Restarting\"}");
ESP.restart();
} else {
if(options->debug_print) Serial.print("try better options?");
sprintf(mqtt_wrapper_topic, "stat/%s/RESULT", options->fullTopic);
client.publish(mqtt_wrapper_topic, "{\"Restart\":\"1 to restart\"}");
}
return;
} else if (strcmp(topic, "status") == 0){
//TODO: This does not match tasmota format. I am not sure I care.
if(options->debug_print) Serial.print("INFO!");
info2();
return;
}
}
//Might have been parsed, but was not handled by function
options->callback(topic, payload, length, &client);
}
void setup_mqtt(struct mqtt_wrapper_options* newOptions) {
options = newOptions;
if(options->debug_print == NULL) {
options->debug_print = true;
}
if(options->telemetryInterval) {
telemetryInterval = options->telemetryInterval;
} else {
telemetryInterval = DEFAULT_TELEMETRY_INTERVAL;
}
nextTelemetry = telemetryInterval;
if(options->debug_print) Serial.println();
if(options->debug_print) Serial.print("Connecting to ");
if(options->debug_print) Serial.println(options->ssid);
WiFi.mode(WIFI_STA);
WiFi.hostname(options->host_name);
wifiMulti.addAP(options->ssid, options->password);
wifiMulti.run();
WiFi.macAddress(macBin);
for (int i = 0; i < sizeof(macBin); ++i){
sprintf(mac + strlen(mac),"%02X:",macBin[i]);
}
mac[strlen(mac)-1] = '\0';
if(options->debug_print) Serial.print("MAC: ");
if(options->debug_print) Serial.println(mac);
randomSeed(micros());
client.setServer(options->mqtt_server, options->mqtt_port);
client.setCallback(internal_callback);
ArduinoOTA.onStart([]() {
if(options->debug_print) Serial.print("Start\n|");
for(int i=0; i<80; ++i){
if(options->debug_print) Serial.print(" ");
}
if(options->debug_print) Serial.print("|\n ");
});
ArduinoOTA.onEnd([]() {
if(options->debug_print) Serial.println("\nEnd");
});
ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
//Static is fine becuase we restart after this. Or crash. Either way.
static int curProg = 0;
int x = map(progress,0,total,0,80);
for(int i=curProg; i<x; ++i){
if(options->debug_print) Serial.print("*");
}
});
ArduinoOTA.onError([](ota_error_t error) {
if(options->debug_print) Serial.printf("Error[%u]: ", error);
if (error == OTA_AUTH_ERROR) if(options->debug_print) Serial.println("Auth Failed");
else if (error == OTA_BEGIN_ERROR) if(options->debug_print) Serial.println("Begin Failed");
else if (error == OTA_CONNECT_ERROR) if(options->debug_print) Serial.println("Connect Failed");
else if (error == OTA_RECEIVE_ERROR) if(options->debug_print) Serial.println("Receive Failed");
else if (error == OTA_END_ERROR) if(options->debug_print) Serial.println("End Failed");
});
ArduinoOTA.begin();
}
void loop_mqtt() {
//Check if mqtt client is connected, if not try to reconnect to it(and wifi)
//Fail in a non-blocking way
//TODO: count failures, do something like reboot or host network?
if (!client.connected()) {
uint32_t now = millis();
if (now - lastReconnectAttempt > 5000) {
lastReconnectAttempt = now;
// Attempt to reconnect
if (reconnect()) {
lastReconnectAttempt = 0;
}
}
} else {
// mqtt client connected
client.loop();//Look for messages and whatnot...
options->connectedLoop(&client);
if(options->telemetry) {
if( (long)( millis() - nextTelemetry ) >= 0) {
nextTelemetry = millis() + telemetryInterval;
options->telemetry(&client);
}
}
}//end mqtt client connected
ArduinoOTA.handle();
}