{"id":37407,"date":"2019-10-31T22:17:29","date_gmt":"2019-10-31T19:17:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/esp8266-upravlenie-cherez-internet-po-protokolu-mqtt\/"},"modified":"2019-10-31T22:17:29","modified_gmt":"2019-10-31T19:17:29","slug":"esp8266-upravlenie-cherez-internet-po-protokolu-mqtt","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/esp8266-upravlenie-cherez-internet-po-protokolu-mqtt","title":{"rendered":"Esp8266 \u0159\u00edzen\u00ed p\u0159es internet pomoc\u00ed protokolu MQTT","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Esp8266
\n Ahoj v\u0161ichni! V tomto \u010dl\u00e1nku bude podrobn\u011b pops\u00e1no a uk\u00e1z\u00e1no, jak doslova za 20 minut voln\u00e9ho \u010dasu nastavit d\u00e1lkov\u00e9 ovl\u00e1d\u00e1n\u00ed modulu esp8266 pomoc\u00ed aplikace na Android p\u0159es protokol MQTT.<\/p>\n

My\u0161lenka d\u00e1lkov\u00e9ho ovl\u00e1d\u00e1n\u00ed a monitorov\u00e1n\u00ed v\u017edy vzru\u0161ovala mysl nad\u0161enc\u016f v oblasti elektroniky a programov\u00e1n\u00ed. Mo\u017enost kdykoli z\u00edskat nebo odeslat pot\u0159ebn\u00e1 data bez ohledu na svou polohu nab\u00edz\u00ed \u0161irok\u00e9 mo\u017enosti. Ve sv\u00fdch p\u0159edchoz\u00edch \u010dl\u00e1nc\u00edch ( \u010cl\u00e1nek 1<\/a><\/noindex> a \u010cl\u00e1nek 2<\/a><\/noindex>) jsem se sna\u017eil prozkoumat n\u011bkolik dostupn\u00fdch a relativn\u011b jednoduch\u00fdch variant realizace d\u00e1lkov\u00e9ho ovl\u00e1d\u00e1n\u00ed mikrokontrol\u00e9ry p\u0159es internet. Av\u0161ak \u010das a cel\u00fd sv\u011bt nez\u016fst\u00e1vaj\u00ed na m\u00edst\u011b \u2013 pokrok pokra\u010duje ne\u00faprosn\u011b vp\u0159ed. B\u011bhem t\u00e9to kr\u00e1tk\u00e9 doby si modul esp8266 z\u00edskal \u0161irokou popularitu, proto\u017ee d\u00edky n\u00edzk\u00e9 cen\u011b a vestav\u011bn\u00e9mu wi-fi se stal jednou z hlavn\u00edch sou\u010d\u00e1st\u00ed \"Chytr\u00e9 dom\u00e1cnosti\".
\n<\/a><\/noindex>
\nV sou\u010dasn\u00e9 dob\u011b je MQTT inovativn\u00ed a nejpopul\u00e1rn\u011bj\u0161\u00ed protokol pro p\u0159enos dat mezi jednotliv\u00fdmi za\u0159\u00edzen\u00edmi v r\u00e1mci syst\u00e9m\u016f \"Chytr\u00e9 dom\u00e1cnosti\". M\u00e1 n\u011bkolik v\u00fdhod oproti jin\u00fdm protokol\u016fm:
\n \u2014 n\u00edzk\u00e1 spot\u0159eba dat;
\n \u2014 spojen\u00ed mezi klientem a serverem je v\u017edy otev\u0159en\u00e9;
\n \u2014 nezat\u011b\u017euje internetov\u00fd kan\u00e1l;
\n \u2014 absence zpo\u017ed\u011bn\u00ed v p\u0159enosu dat;
\n \u2014 pohodln\u00fd syst\u00e9m odb\u011bru na t\u00e9mata;
\n To v\u0161e umo\u017e\u0148uje monitorov\u00e1n\u00ed a ovl\u00e1d\u00e1n\u00ed v re\u00e1ln\u00e9m \u010dase. Nicm\u00e9n\u011b MQTT vy\u017eaduje existenci vlastn\u00edho serveru, kter\u00fd slou\u017e\u00ed jako prost\u0159edn\u00edk mezi klienty s\u00edt\u011b. Tady jsou dv\u011b cesty: bu\u010f vytvo\u0159it sv\u016fj vlastn\u00ed server nebo pou\u017e\u00edvat extern\u00ed slu\u017eby.<\/p>\n

Popisovan\u00fd syst\u00e9m \u0159\u00edzen\u00ed se skl\u00e1d\u00e1 ze dvou hlavn\u00edch \u010d\u00e1st\u00ed: serveru MQTT (obvykle je jen jeden) a klient\u016f, kter\u00fdch m\u016f\u017ee b\u00fdt pom\u011brn\u011b hodn\u011b. V na\u0161em p\u0159\u00edpad\u011b budou klienty aplikace na Android a samotn\u00fd modul esp8266.<\/p>\n

Algoritmus fungov\u00e1n\u00ed syst\u00e9mu je n\u00e1sleduj\u00edc\u00ed. Klienti se p\u0159ipojuj\u00ed k serveru a hned po p\u0159ipojen\u00ed se ka\u017ed\u00fd z nich p\u0159ihl\u00e1s\u00ed k t\u00e9mat\u016fm, kter\u00e9 je zaj\u00edmaj\u00ed. Ve\u0161ker\u00e1 komunikace mezi klienty prob\u00edh\u00e1 tranzitn\u011b p\u0159es server, kter\u00fd p\u0159esm\u011brov\u00e1v\u00e1 data jin\u00fdm klient\u016fm s ohledem na jejich odb\u011bry.<\/p>\n

MQTT server. <\/b><\/p>\n

V na\u0161em p\u0159\u00edpad\u011b pou\u017eijeme velmi pohodlnou slu\u017ebu www.cloudmqtt.com<\/a><\/noindex> kter\u00e1 m\u00e1 bezplatn\u00fd tarif (Cute Cat), kter\u00fd pln\u011b pokryje pot\u0159eby pro realizaci mal\u00e9 vlastn\u00ed \"inteligentn\u00ed dom\u00e1cnosti\".
\n\"Esp8266
\n Zaregistrujeme se na webu a z\u00edsk\u00e1me pot\u0159ebn\u00e9 \u00fadaje pro p\u0159\u00edstup k serveru. P\u0159i nastavov\u00e1n\u00ed klient\u016f je nutn\u00e9 pou\u017e\u00edt standardn\u00ed port (bez SSL a TLS).
\n\"Esp8266
\n
\nAplikace pro Android.<\/b><\/p>\n

Na\u0161e aplikace bude slou\u017eit jako ovl\u00e1dac\u00ed panel pro mikro\u0159adi\u010d a tak\u00e9 bude p\u0159ij\u00edmat a zobrazovat v\u0161echny informace p\u0159ij\u00edman\u00e9 od esp8266.<\/p>\n

Aplikace se jmenuje IoT MQTT Dashboard<\/a><\/noindex> a p\u0159edstavuje hotov\u00e9ho mqtt klienta s n\u011bkolika velmi u\u017eite\u010dn\u00fdmi widgety. Podrobnosti o pr\u00e1ci s aplikac\u00ed si m\u016f\u017eete prohl\u00e9dnout na videu.<\/p>\n

Esp8266.<\/b><\/p>\n

Modul se programuje v prost\u0159ed\u00ed Arduino, ale chci poznamenat, \u017ee modul m\u00e1 probl\u00e9my s nahr\u00e1v\u00e1n\u00edm v posledn\u00edch verz\u00edch Arduina, proto doporu\u010duji pou\u017e\u00edt verzi 1.6.4.
\nJako p\u0159\u00edklad je k esp8266 p\u0159ipojena LED dioda (pin 5) a teplotn\u00ed senzor ds18b20 (pin 2).
\nProto\u017ee pro ovl\u00e1d\u00e1n\u00ed LED diody je nutn\u00e9 z\u00edsk\u00e1vat data, mus\u00ed se esp po p\u0159ipojen\u00ed p\u0159ihl\u00e1sit k odpov\u00eddaj\u00edc\u00edmu topicu \"test\/led\", jinak v\u0161echny odeslan\u00e9 \u00fadaje projdou kolem na\u0161eho mikro\u0159adi\u010de.
\nPro odes\u00edl\u00e1n\u00ed teplotn\u00edch dat nen\u00ed pot\u0159eba p\u0159ihl\u00e1\u0161en\u00ed, ale p\u0159i p\u0159evodu teplotn\u00edch hodnot je nutn\u00e9 uv\u00e9st topic, do kter\u00e9ho tyto \u00fadaje p\u016fjdou.<\/p>\n

N\u00ed\u017ee je uveden skica s podrobn\u00fdmi koment\u00e1\u0159i.<\/p>\n

Skica Esp8266_mqtt.ino<\/b>\/\/ \u0421\u0432\u0435\u0442\u043e\u0434\u0438\u043e\u0434 \u043f\u043e\u0434\u043b\u043a\u044e\u0447\u0435\u043d \u043a 5 \u043f\u0438\u043d\u0443
\n\/\/ \u0414\u0430\u0442\u0447\u0438\u043a \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b ds18b20 \u043a 2 \u043f\u0438\u043d\u0443<\/p>\n

#include <ESP8266WiFi.h>
\n#include <PubSubClient.h>
\n#include <OneWire.h>
\n#include <DallasTemperature.h><\/p>\n

#define ONE_WIRE_BUS 2
\nOneWire oneWire(ONE_WIRE_BUS);
\nDallasTemperature senzory(&oneWire);<\/p>\n

const char *ssid = \"AIRPORT\"; \/\/ N\u00e1zev WiFi p\u0159\u00edstupov\u00e9ho bodu
\nconst char *pass = \"PASSWORD\"; \/\/ Heslo k p\u0159\u00edstupov\u00e9mu bodu<\/p>\n

const char *mqtt_server = \"server\"; \/\/ N\u00e1zev MQTT serveru
\nconst int mqtt_port = 11140; \/\/ Port pro p\u0159ipojen\u00ed k MQTT serveru
\nconst char *mqtt_user = \"Login\"; \/\/ U\u017eivatelsk\u00e9 jm\u00e9no ze serveru
\nconst char *mqtt_pass = \"Pass\"; \/\/ Heslo ze serveru<\/p>\n

#define BUFFER_SIZE 100<\/p>\n

bool LedState = false;
\nint tm=300;
\nfloat temp=0;<\/p>\n

\/\/ \u0424\u0443\u043d\u043a\u0446\u0438\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u043e\u0442 \u0441\u0435\u0440\u0432\u0435\u0440\u0430<\/p>\n

void callback(const MQTT::Publish& pub)
\n{
\n Serial.print(pub.topic()); \/\/ Vypisujeme do s\u00e9riov\u00e9ho portu n\u00e1zev topicu
\n Serial.print(\" => \");
\n Serial.print(pub.payload_string()); \/\/ Vypisujeme do s\u00e9riov\u00e9ho portu hodnotu p\u0159ijat\u00fdch dat<\/p>\n

String payload = pub.payload_string();<\/p>\n

if(String(pub.topic()) == \"test\/led\") \/\/ kontrolujeme, ze data p\u0159i\u0161la z po\u017eadovan\u00e9ho topiku
\n {
\n int stled = payload.toInt(); \/\/ P\u0159ev\u00e1d\u00edme p\u0159ijat\u00e9 \u00fadaje na typ integer
\n digitalWrite(5, stled); \/\/ Zap\u00edn\u00e1me nebo vyp\u00edn\u00e1me LED diodu podle p\u0159ijat\u00fdch hodnot
\n }
\n}<\/p>\n

WiFiClient wclient;
\nPubSubClient client(wclient, mqtt_server, mqtt_port);<\/p>\n

void setup() {<\/p>\n

sensors.begin();
\n Serial.begin(115200);
\n delay(10);
\n Serial.println();
\n Serial.println();
\n pinMode(5, OUTPUT);
\n}<\/p>\n

void loop() {
\n \/\/ \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0435\u043c\u0441\u044f \u043a wi-fi
\n if (WiFi.status() != WL_CONNECTED) {
\n Serial.print(\"P\u0159ipojuji se k \");
\n Serial.print(ssid);
\n Serial.println(\"...\");
\n WiFi.begin(ssid, pass);<\/p>\n

if (WiFi.waitForConnectResult() != WL_CONNECTED)
\n return;
\n Serial.println(\"WiFi p\u0159ipojeno\");
\n }<\/p>\n

\/\/ \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0435\u043c\u0441\u044f \u043a MQTT \u0441\u0435\u0440\u0432\u0435\u0440\u0443
\n if (WiFi.status() == WL_CONNECTED) {
\n if (!client.connected()) {
\n Serial.println(\"P\u0159ipojuji se k MQTT serveru\");
\n if (client.connect(MQTT::Connect(\"arduinoClient2\")
\n .set_auth(mqtt_user, mqtt_pass))) {
\n Serial.println(\"P\u0159ipojeno k MQTT serveru\");
\n client.set_callback(callback);
\n client.subscribe(\"test\/led\"); \/\/ p\u0159ihla\u0161ujeme se k topiku s daty pro LED
\n } else {
\n Serial.println(\"Nelze se p\u0159ipojit k MQTT serveru\");
\n }
\n }<\/p>\n

if (client.connected()){
\n client.loop();
\n TempSend();
\n }<\/p>\n

}
\n} \/\/ konec hlavn\u00edho cyklu<\/p>\n

\/\/ \u0424\u0443\u043d\u043a\u0446\u0438\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u0438\u0439 \u0441 \u0442\u0435\u0440\u043c\u043e\u0434\u0430\u0442\u0447\u0438\u043a\u0430
\nvoid TempSend(){
\n if (tm==0)
\n {
\n sensors.requestTemperatures(); \/\/ z\u00edskat hodnotu teploty ze senzoru
\n float temp = sensors.getTempCByIndex(0);
\n client.publish(\"test\/temp\",String(temp)); \/\/ pos\u00edl\u00e1me hodnotu teploty do topiku pro termodetektor
\n Serial.println(temp);
\n tm = 300; \/\/ pauza mezi odes\u00edl\u00e1n\u00edm hodnot teploty p\u0159ibli\u017en\u011b 3 sekundy
\n }
\n tm--;
\n delay(10);
\n}
\n<\/code><\/p>\n

\nV d\u016fsledku toho m\u00e1me pohodln\u00fd n\u00e1stroj pro vzd\u00e1len\u00e9 \u0159\u00edzen\u00ed a monitorov\u00e1n\u00ed \u00fadaj\u016f, kter\u00fd je pom\u011brn\u011b snadno ovladateln\u00fd a zvl\u00e1dne ho i za\u010d\u00e1te\u010dn\u00edk.<\/p>\n

Video s uk\u00e1zkou funkce \u0159\u00eddic\u00edho syst\u00e9mu<\/b>
\n

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Podrobn\u00fd video n\u00e1vod na nastaven\u00ed syst\u00e9mu<\/b>
\n

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Jeden z variant aplikace \u0159\u00edzen\u00ed esp8266 p\u0159es MQTT protokol<\/b>
\n

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Ovl\u00e1d\u00e1n\u00ed LED p\u00e1sku p\u0159es internet<\/b>
\n

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Pokud m\u00e1te dotazy k tomuto materi\u00e1lu, doporu\u010duji se pod\u00edvat na druhou \u010d\u00e1st videa, kde je materi\u00e1l pod\u00e1n n\u00e1zorn\u011bji.<\/p>\n

V archivu se nach\u00e1z\u00ed skica a v\u0161echny pot\u0159ebn\u00e9 knihovny pro nahr\u00e1n\u00ed mikrokontrol\u00e9ru skicou z p\u0159\u00edkladu.
\nV\u011bnuji va\u0161\u00ed pozornosti, \u017ee knihovna ESP8266WiFi.h nen\u00ed sou\u010d\u00e1st\u00ed tohoto archivu, je t\u0159eba ji nainstalovat p\u0159es spr\u00e1vce desek v prost\u0159ed\u00ed Arduino.<\/p>\n

ARCHIV<\/b><\/a><\/noindex><\/p>\n

MQTT server \u2014 www.cloudmqtt.com<\/a><\/noindex><\/p>\n

Odkaz na aplikaci IoT MQTT Dashboard \u2014 play.google.com\/store\/apps\/details?id=com.thn.iotmqttdashboard&hl=cs<\/a><\/noindex><\/p>\n

D\u011bkuji v\u0161em za pozornost.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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