Basic ESP8266 code with GPIO, MQTT and stdout.
C Makefile C++
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README.md


Basic ESP8266 code with GPIO, MQTT and stdout.

Works and tested on ESP8266-01


Features


Reads GPIO swtich status Interupt driven key switih reader on GPIO0. (switch must be on high when booting.)

Publishes on /ESP-01/GPIO00 with "1" or "0".

Switch triggers - subcribes to /ESP-01/GPIO02 with "1" or "0" to trigger GPIO2.

Publishes "hello" on /ESP-01/status on boot

LWT on boot as "offline" on /ESP-01/status

Workaround fix for my ESP8266-01 not loading the SSID from flash.


GPIO code from SDK Example folder + various sources on the net.


esp8266_stdout


A clone of Jeroen Domburg's (jeroen@spritesmods.com) stdout driver. It's an alternative uart driver that only uses the TX pin, so the RX pin is free for GPIO use.

Needless to say, but this driver can only transmit.

License:

"THE BEER-WARE LICENSE" (Revision 42): Jeroen Domburg jeroen@spritesmods.com wrote this file. As long as you retain this notice you can do whatever you want with this stuff. If we meet some day, and you think this stuff is worth it, you can buy me a beer in return.


MQTT code based on https://github.com/tuanpmt/esp_mqtt


This is MQTT client library for ESP8266, port from: MQTT client library for Contiki (thanks)

Features:

  • Support subscribing, publishing, authentication, will messages, keep alive pings and all 3 QoS levels (it should be a fully functional client).
  • Support multiple connection (to multiple hosts).
  • Support SSL connection (max 1024 bit key size)
  • Easy to setup and use

Compile:

Make sure to add PYTHON PATH and compile PATH to Eclipse environment variable if using Eclipse

for Windows:

git clone https://github.com/terenceang/esp8266-basic-gpio-mqtt-stdout.git
cd esp_mqtt
#clean
mingw32-make clean
#make
mingw32-make SDK_BASE="c:/Espressif/ESP8266_SDK" FLAVOR="release" all
#flash
mingw32-make ESPPORT="COM1" flash

for Mac or Linux:

git clone https://github.com/terenceang/esp8266-basic-gpio-mqtt-stdout.git
cd esp_mqtt
#clean
make clean
#make
make SDK_BASE="/opt/Espressif/ESP8266_SDK" FLAVOR="release" all
#flash
make ESPPORT="/dev/ttyUSB0" flash

Usage

#include "ets_sys.h"
#include "driver/uart.h"
#include "osapi.h"
#include "mqtt.h"
#include "wifi.h"
#include "config.h"
#include "debug.h"
#include "gpio.h"
#include "user_interface.h"
#include "mem.h"

MQTT_Client mqttClient;

void wifiConnectCb(uint8_t status)
{
    if(status == STATION_GOT_IP){
        MQTT_Connect(&mqttClient);
    } else {
        MQTT_Disconnect(&mqttClient);
    }
}
void mqttConnectedCb(uint32_t *args)
{
    MQTT_Client* client = (MQTT_Client*)args;
    INFO("MQTT: Connected\r\n");
    MQTT_Subscribe(client, "/mqtt/topic/0", 0);
    MQTT_Subscribe(client, "/mqtt/topic/1", 1);
    MQTT_Subscribe(client, "/mqtt/topic/2", 2);

    MQTT_Publish(client, "/mqtt/topic/0", "hello0", 6, 0, 0);
    MQTT_Publish(client, "/mqtt/topic/1", "hello1", 6, 1, 0);
    MQTT_Publish(client, "/mqtt/topic/2", "hello2", 6, 2, 0);

}

void mqttDisconnectedCb(uint32_t *args)
{
    MQTT_Client* client = (MQTT_Client*)args;
    INFO("MQTT: Disconnected\r\n");
}

void mqttPublishedCb(uint32_t *args)
{
    MQTT_Client* client = (MQTT_Client*)args;
    INFO("MQTT: Published\r\n");
}

void mqttDataCb(uint32_t *args, const char* topic, uint32_t topic_len, const char *data, uint32_t data_len)
{
    char *topicBuf = (char*)os_zalloc(topic_len+1),
            *dataBuf = (char*)os_zalloc(data_len+1);

    MQTT_Client* client = (MQTT_Client*)args;

    os_memcpy(topicBuf, topic, topic_len);
    topicBuf[topic_len] = 0;

    os_memcpy(dataBuf, data, data_len);
    dataBuf[data_len] = 0;

    INFO("Receive topic: %s, data: %s \r\n", topicBuf, dataBuf);
    os_free(topicBuf);
    os_free(dataBuf);
}


void user_init(void)
{
    uart_init(BIT_RATE_115200, BIT_RATE_115200);
    os_delay_us(1000000);

    CFG_Load();

    MQTT_InitConnection(&mqttClient, sysCfg.mqtt_host, sysCfg.mqtt_port, sysCfg.security);
    //MQTT_InitConnection(&mqttClient, "192.168.11.122", 1880, 0);

    MQTT_InitClient(&mqttClient, sysCfg.device_id, sysCfg.mqtt_user, sysCfg.mqtt_pass, sysCfg.mqtt_keepalive, 1);
    //MQTT_InitClient(&mqttClient, "client_id", "user", "pass", 120, 1);

    MQTT_InitLWT(&mqttClient, "/lwt", "offline", 0, 0);
    MQTT_OnConnected(&mqttClient, mqttConnectedCb);
    MQTT_OnDisconnected(&mqttClient, mqttDisconnectedCb);
    MQTT_OnPublished(&mqttClient, mqttPublishedCb);
    MQTT_OnData(&mqttClient, mqttDataCb);

    WIFI_Connect(sysCfg.sta_ssid, sysCfg.sta_pwd, wifiConnectCb);

    INFO("\r\nSystem started ...\r\n");
}

Publish message and Subscribe

/* TRUE if success */
BOOL MQTT_Subscribe(MQTT_Client *client, char* topic, uint8_t qos);

BOOL MQTT_Publish(MQTT_Client *client, const char* topic, const char* data, int data_length, int qos, int retain);

Already support LWT: (Last Will and Testament)

/* Broker will publish a message with qos = 0, retain = 0, data = "offline" to topic "/lwt" if client don't send keepalive packet */
MQTT_InitLWT(&mqttClient, "/lwt", "offline", 0, 0);

Default configuration

See: include/user_config.h

If you want to load new default configurations, just change the value of CFG_HOLDER in include/user_config.h

Define protocol name in include/user_config.h

#define PROTOCOL_NAMEv31    /*MQTT version 3.1 compatible with Mosquitto v0.15*/
//PROTOCOL_NAMEv311         /*MQTT version 3.11 compatible with https://eclipse.org/paho/clients/testing/*/

In the Makefile, it will erase section hold the user configuration at 0x3C000

flash: firmware/0x00000.bin firmware/0x40000.bin
    $(PYTHON) $(ESPTOOL) -p $(ESPPORT) write_flash 0x00000 firmware/0x00000.bin 0x3C000 $(BLANKER) 0x40000 firmware/0x40000.bin 

The BLANKER is the blank.bin file you find in your SDKs bin folder.

Create SSL Self sign

openssl req -x509 -newkey rsa:1024 -keyout key.pem -out cert.pem -days XXX

SSL Mqtt broker for test

var mosca = require('mosca')
var SECURE_KEY = __dirname + '/key.pem';
var SECURE_CERT = __dirname + '/cert.pem';
var ascoltatore = {
  //using ascoltatore
  type: 'mongo',
  url: 'mongodb://localhost:27017/mqtt',
  pubsubCollection: 'ascoltatori',
  mongo: {}
};

var moscaSettings = {
  port: 1880,
  stats: false,
  backend: ascoltatore,
  persistence: {
    factory: mosca.persistence.Mongo,
    url: 'mongodb://localhost:27017/mqtt'
  },
  secure : {
    keyPath: SECURE_KEY,
    certPath: SECURE_CERT,
    port: 1883
  }
};

var server = new mosca.Server(moscaSettings);
server.on('ready', setup);

server.on('clientConnected', function(client) {
    console.log('client connected', client.id);
});

// fired when a message is received
server.on('published', function(packet, client) {
  console.log('Published', packet.payload);
});

// fired when the mqtt server is ready
function setup() {
  console.log('Mosca server is up and running')
}

Example projects using esp_mqtt:

Limited:

  • Not fully supported retransmit for QoS1 and QoS2

Status: Pre release.

https://github.com/tuanpmt/esp_mqtt/releases

MQTT Broker for test

MQTT Client for test

Contributing:

Feel free to contribute to the project in any way you like!

Requried:

SDK esp_iot_sdk_v0.9.4_14_12_19 or higher

Authors: Tuan PM

Donations

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LICENSE - "MIT License"

Copyright (c) 2014-2015 Tuan PM, https://twitter.com/TuanPMT

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

esp8266-basic-gpio-mqtt-stdout