ESP8266 / Mbed 2 deprecated ESP8266_MQTT_HelloWorld

Example MQTT implemented on the ESP8266

Dependencies:   ESP8266Interface MQTT mbed-rtos mbed

Fork of HelloMQTT by MQTT

This is an example of how to run MQTT using the esp8266 as the network connection. This program will default to trying to talk to a public MQTT server (test.mosquitto.org). The example will subscribe to a topic and then publish to that topic. In this way it will effectively echo back to itself. You can alternatively use a private mqtt broker,[[TODO: |instructions here]]

Please note that the ESP8266 interface cannot translate hostnames to IP Addresses, it can only accept raw IP Addresses as input.

main.cpp@18:76d0899bc3ce, 2015-06-09 (annotated)

Committer:
mbedAustin
Date:
Tue Jun 09 17:57:43 2015 +0000
Revision:
18:76d0899bc3ce
Parent:
17:92a64d43ee61 
double checked everything working. Pub/sub to same topic for self echoing.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 1:a1d5c7a6acbc 1 /*******************************************************************************
icraggs 1:a1d5c7a6acbc 2 * Copyright (c) 2014 IBM Corp.
icraggs 1:a1d5c7a6acbc 3 *
icraggs 1:a1d5c7a6acbc 4 * All rights reserved. This program and the accompanying materials
icraggs 1:a1d5c7a6acbc 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 1:a1d5c7a6acbc 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 1:a1d5c7a6acbc 7 *
icraggs 1:a1d5c7a6acbc 8 * The Eclipse Public License is available at
icraggs 1:a1d5c7a6acbc 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 1:a1d5c7a6acbc 10 * and the Eclipse Distribution License is available at
icraggs 1:a1d5c7a6acbc 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 1:a1d5c7a6acbc 12 *
icraggs 1:a1d5c7a6acbc 13 * Contributors:
icraggs 1:a1d5c7a6acbc 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 1:a1d5c7a6acbc 15 *******************************************************************************/
geky 17:92a64d43ee61 16
geky 17:92a64d43ee61 17 /**
geky 17:92a64d43ee61 18 This is a sample program to illustrate the use of the MQTT Client library
geky 17:92a64d43ee61 19 on the mbed platform. The Client class requires two classes which mediate
geky 17:92a64d43ee61 20 access to system interfaces for networking and timing. As long as these two
geky 17:92a64d43ee61 21 classes provide the required public programming interfaces, it does not matter
geky 17:92a64d43ee61 22 what facilities they use underneath. In this program, they use the mbed
geky 17:92a64d43ee61 23 system libraries.
geky 17:92a64d43ee61 24
geky 17:92a64d43ee61 25 */
icraggs 1:a1d5c7a6acbc 26
icraggs 2:638c854c0695 27
geky 17:92a64d43ee61 28 #include "MQTTESP8266.h"
icraggs 2:638c854c0695 29 #include "MQTTClient.h"
icraggs 2:638c854c0695 30
icraggs 2:638c854c0695 31 int arrivedcount = 0;
icraggs 2:638c854c0695 32
mbedAustin 18:76d0899bc3ce 33 // callback for subscribe topic
mbedAustin 18:76d0899bc3ce 34 void subscribeCallback(MQTT::MessageData& md)
icraggs 2:638c854c0695 35 {
icraggs 9:5beb8609e9f7 36 MQTT::Message &message = md.message;
mbedAustin 18:76d0899bc3ce 37 printf("Message received: qos %d, retained %d, dup %d, packetid %d\n", message.qos, message.retained, message.dup, message.id);
icraggs 9:5beb8609e9f7 38 printf("Payload %.*s\n", message.payloadlen, (char*)message.payload);
icraggs 2:638c854c0695 39 ++arrivedcount;
icraggs 2:638c854c0695 40 }
icraggs 0:0cae29831d01 41
mbedAustin 18:76d0899bc3ce 42 // main function that sets up the subscription and makes a couple publishes
icraggs 2:638c854c0695 43 int main(int argc, char* argv[])
geky 17:92a64d43ee61 44 {
geky 17:92a64d43ee61 45 printf("Starting\n");
mbedAustin 18:76d0899bc3ce 46 MQTTESP8266 ipstack(D1, D0, D10, "demossid","passphrase"); // change to match your wifi access point
icraggs 9:5beb8609e9f7 47 float version = 0.47;
icraggs 2:638c854c0695 48 char* topic = "mbed-sample";
geky 17:92a64d43ee61 49
sam_grove 5:4a257f6ac09a 50 printf("Version is %f\n", version);
geky 17:92a64d43ee61 51
geky 17:92a64d43ee61 52 MQTT::Client<MQTTESP8266, Countdown> client = MQTT::Client<MQTTESP8266, Countdown>(ipstack);
geky 17:92a64d43ee61 53
mbedAustin 18:76d0899bc3ce 54 char* hostname = "85.119.83.194"; // test.mosquitto.org
icraggs 6:e4c690c45021 55 int port = 1883;
icraggs 6:e4c690c45021 56 int rc = ipstack.connect(hostname, port);
icraggs 6:e4c690c45021 57 if (rc != 0)
geky 17:92a64d43ee61 58 printf("rc from TCP connect is %d\n", rc);
geky 17:92a64d43ee61 59
geky 17:92a64d43ee61 60 MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
icraggs 6:e4c690c45021 61 data.MQTTVersion = 3;
mbedAustin 18:76d0899bc3ce 62 data.clientID.cstring = "mbed-clientID";
icraggs 12:086a9314e8a5 63 data.username.cstring = "testuser";
icraggs 12:086a9314e8a5 64 data.password.cstring = "testpassword";
icraggs 16:28d062c5522b 65 if ((rc = client.connect(data)) != 0)
geky 17:92a64d43ee61 66 printf("rc from MQTT connect is %d\n", rc);
geky 17:92a64d43ee61 67
mbedAustin 18:76d0899bc3ce 68 if ((rc = client.subscribe(topic, MQTT::QOS1, subscribeCallback)) != 0)
mbedAustin 18:76d0899bc3ce 69 printf("Recv'd from MQTT subscribe is %d\n", rc);
icraggs 2:638c854c0695 70
icraggs 2:638c854c0695 71 MQTT::Message message;
icraggs 0:0cae29831d01 72
icraggs 2:638c854c0695 73 // QoS 0
icraggs 2:638c854c0695 74 char buf[100];
icraggs 2:638c854c0695 75 sprintf(buf, "Hello World! QoS 0 message from app version %f\n", version);
icraggs 2:638c854c0695 76 message.qos = MQTT::QOS0;
icraggs 2:638c854c0695 77 message.retained = false;
icraggs 2:638c854c0695 78 message.dup = false;
icraggs 2:638c854c0695 79 message.payload = (void*)buf;
icraggs 2:638c854c0695 80 message.payloadlen = strlen(buf)+1;
icraggs 16:28d062c5522b 81 rc = client.publish(topic, message);
icraggs 12:086a9314e8a5 82 while (arrivedcount < 1)
icraggs 2:638c854c0695 83 client.yield(100);
geky 17:92a64d43ee61 84
icraggs 2:638c854c0695 85 // QoS 1
icraggs 2:638c854c0695 86 sprintf(buf, "Hello World! QoS 1 message from app version %f\n", version);
icraggs 2:638c854c0695 87 message.qos = MQTT::QOS1;
icraggs 2:638c854c0695 88 message.payloadlen = strlen(buf)+1;
icraggs 16:28d062c5522b 89 rc = client.publish(topic, message);
icraggs 12:086a9314e8a5 90 while (arrivedcount < 2)
icraggs 2:638c854c0695 91 client.yield(100);
geky 17:92a64d43ee61 92
icraggs 2:638c854c0695 93 // QoS 2
icraggs 2:638c854c0695 94 sprintf(buf, "Hello World! QoS 2 message from app version %f\n", version);
icraggs 2:638c854c0695 95 message.qos = MQTT::QOS2;
icraggs 2:638c854c0695 96 message.payloadlen = strlen(buf)+1;
icraggs 16:28d062c5522b 97 rc = client.publish(topic, message);
icraggs 12:086a9314e8a5 98 while (arrivedcount < 3)
icraggs 2:638c854c0695 99 client.yield(100);
geky 17:92a64d43ee61 100
icraggs 12:086a9314e8a5 101 // n * QoS 2
geky 17:92a64d43ee61 102 for (int i = 1; i <= 10; ++i) {
icraggs 12:086a9314e8a5 103 sprintf(buf, "Hello World! QoS 2 message number %d from app version %f\n", i, version);
icraggs 12:086a9314e8a5 104 message.qos = MQTT::QOS2;
icraggs 12:086a9314e8a5 105 message.payloadlen = strlen(buf)+1;
icraggs 16:28d062c5522b 106 rc = client.publish(topic, message);
icraggs 12:086a9314e8a5 107 while (arrivedcount < i + 3)
icraggs 12:086a9314e8a5 108 client.yield(100);
icraggs 12:086a9314e8a5 109 }
geky 17:92a64d43ee61 110
icraggs 8:a3e3113054a1 111 if ((rc = client.unsubscribe(topic)) != 0)
sam_grove 5:4a257f6ac09a 112 printf("rc from unsubscribe was %d\n", rc);
geky 17:92a64d43ee61 113
icraggs 8:a3e3113054a1 114 if ((rc = client.disconnect()) != 0)
sam_grove 5:4a257f6ac09a 115 printf("rc from disconnect was %d\n", rc);
geky 17:92a64d43ee61 116
icraggs 2:638c854c0695 117 ipstack.disconnect();
sam_grove 5:4a257f6ac09a 118 printf("Finishing with %d messages received\n", arrivedcount);
geky 17:92a64d43ee61 119
icraggs 0:0cae29831d01 120 return 0;
icraggs 0:0cae29831d01 121 }