STM32 开发板引脚：
STM32F10x引脚接口
MACEEP_SCL_Pin—->PB6—->替换成PB10
MACEEP_SDA_Pin—->PB7—->替换成PB11
USART RX —->PA10
USART TX —->PA9
LED1_Pin —->PE0—->替换成PB5
LED2_Pin —->PE1—->替换成PE5
W5500_RESET_PIN —->PD10
W5500_INT_PIN —->PD11
W5500_CS_PIN —->PA4
W5500_CLK_PIN —->PA5
W5500_MISO_PIN —->PA6
W5500_MOSI_PIN —->PA7
Step 1: Stuffs that you have to prepare.
1. W5500 Embedded Ethernet Board.
- W5500 with Cortex M Series recommended. I used my custom board. My custom ethernet board includes W5500 and stm32f103vc(ST’s cortex M3).
2. IDE.
- Whatever you want. I used CoIDE(with gcc).
3. Broker Server.
- A. Use Cloud Services, such as CloudMQTT. - Recommended.
- B. Make you own broker server using cloud server service, such as google cloud or aws.
Step 2: Preparing Broker server - CloudMQTT
1. Visit the http://www.cloudmqtt.com/
2. Sign up with your e-mail and login.
3. Create CloudMQTT Instance.
4. Complete.
Step 3: Paho mqtt library download and import.
1. Visit the https://eclipse.org/paho/
2. Download C/C++ MQTT Embedded clients and unzip.
3. Import MQTT library(You have to import 1 Folder & 2 Files)
A. Folder: c:\your downdload path\org.eclipse.paho.mqtt.embedded-c-1.0.0\MQTTPacket\src
B. Files: c:\your downdload path\org.eclipse.paho.mqtt.embedded-c-1.0.0\MQTTClient-C\src MQTTClient.c & .h files.
Step 4: MQTT Library porting.
1. Create new file. MQTTInterface.c & MQTTInterface.h (File name is not important.)
2. Define the functions and structures.
3. coding Main() using MQTT library.
You can download full source code from my github:https://github.com/bangbh81/paho-mqtt-subscribe-example
Step 5: Test
1. MQTT FX(mqtt pc client software from http://mqttfx.jfx4ee.org/
2. make a connection propile using CloudMQTT Instance info.
A. Broker Server Address
B. Broker Port
C. User Name
D. Password
3. Connect and Write a topic & data.
4. Click publish.
5. Check the mqtt client works well.
