This demo application connects to AWS IoT through MQTT, subscribes to topics and publishes messages.
It requires an active and properly configured thing.
You can use the AWS IoT MQTT client in the AWS IoT console to watch the MQTT messages sent and received by AWS IoT.
The following describes the various components and the configuration settings.
Once the application is configured you can:
- Build the application
- Connect the debugger
- Run the application and view messages in a debug printf or terminal window
The file iot_config.h configures the connection to AWS IoT with these settings:
- IOT_DEMO_SERVER: Remote Host
- IOT_DEMO_ROOT_CA: Trusted Server Root Certificate
- IOT_DEMO_CLIENT_CERT: Client Certificate
- IOT_DEMO_PRIVATE_KEY: Client Private Key
- IOT_DEMO_IDENTIFIER: Thing Identifier
Note: These settings need to be configured by the user!
The FreeRTOS RTOS implements the resource management. It is configured with the following settings:
- Global Dynamic Memory size: 24000 bytes
- Default Thread Stack size: 3072 bytes
This implementation uses an IoT socket layer that connects to a CMSIS-Driver WiFi.
The file socket_startup.c configures the WiFi connection with these settings:
- SSID: network identifier
- PASSWORD: network password
- SECURITY_TYPE: network security
Note: These settings need to be configured by the user!
The ESP8266 WiFi Module is connected via an Arduino connector using a USART interface. It exposes a CMSIS-Driver WiFi.
The Board layer contains the following configured interface drivers:
CMSIS-Driver USART1 routed to Virtual COM port (DAPLink):
- RX: UART1_RX
- TX: UART1_TX
CMSIS-Driver USART0 routed to Arduino UNO R3 connector (J15):
- RX: D0 GPIO0 (PA0)
- TX: D1 GPIO1 (PA7)
STDOUT routed to Virtual COM port (DAPLink, baudrate = 115200)