iot-central-firmware/freeRTOS/b-l475e-iot01a1-bg96-verizon

Step by step - Azure IoT - Free RTOS verizon kit sample (b-l475e-iot01a1-bg96)

Setting up the dev environment and building the sample

• Download OpenSTM32 SystemWorkbench from this URL You will need to register / login to access downloads.

• Clone this repository -> git clone https://github.com/azure/iot-central-firmware

• Open SystemWorkbench on your desktop.

• Right click to empty white space on the project explorer tab. Select Import

• Select Existing Projects into Workspace and click Next

• Browse into iot-central-firmware/freeRTOS/b-l475e-iot01a1-bg96-verizon/azure_iotc_sample folder

• See azure_iotc_sample folder is selected as root directory and click Finish

• Visit AzureIoTCentral and create a new application.

• Select Sample Devkits

• Add a new mxchip device. (a real device) (under Device Explorer)

• Browse into device UI (by clicking to name of the device under Device explorer)

• Click/open Connect at top-right of the device UI

• Grab scopeId, device Id and primary key (DEVICE_KEY) and fill the necessary parts under iotc_sample.cpp as shown on the screenshot below.

• Right click to azure_iotc_sample project name on the project explorer tab and click to Build Project

• If you see any error, again right click to azure_iotc_sample but this time select, Index > Rebuild.. and then Build the project as explained on the previous step.

• Finally, you will find the binary file (azure_iotc_sample_debug.bin) under azure_iotc_sample/st/stm32l475_discovery/ac6/Debug location. (this location is relative to project folder you have cloned).

• Connect your board to your computer. If you are on Windows, you will need to install a driver from https://www.st.com/en/development-tools/stsw-link009.html

• Drag and drop the azure_iotc_sample_debug.bin file into board from the file explorer. You should see the board as an external usb drive.

Api and pinpoints

• This sample uses iotc thin client api. See IOTC.md for more.
• src/iotc_sample.cpp file contains the application logic and authentication to azure iot.
• Find void iotc_main(void* pvParameters) under iotc_sample.cpp to see
  • how to connect
  • how to send telemetry and reported properties
• onConnectionStatus / onSettingsUpdated / onCommand / onEvent.. are the callbacks for iotc client.

Device logs

• in order to see the logs, you should look into serial terminal. i.e. nodemcu is a practical cross platform tool you may try. Install => npm install -g nodemcu-tool

• Find your board .. (on Windows, you should find the COM port, while on *nix, you should look into /dev folder)

i.e. nodemcu-tool -p /dev/tty.usbmodem14103 -b 115200 terminal was working on my machine. Do not expect /dev/tty.usbmodem14103 to work on your machine. On Windows, it will be something like COMXXX. Look into Device explorer and see which USB COM port is used by ST driver. On *nix try tab key after /dev/tty. or /dev/usb. to see the available devices and select the right one.