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iothub_ll_telemetry_sample application

1. Prepare IoT Hub and Device for this example

1.1. Azure portal

In Azure portal, you need to create a device and get the connection string informations as below:

image

  • This example uses symmetric key

image image image

  • You copy the key string,"Primary Connection String" and paste the string into your code as decribed in next section.

image

1.2. Developer PC

1.2.1. SDK setting

In the following WIZnet-PICO-AZURE-C/exmaples/main.c source file, find the line similar to this and replace it as you want:

(...)

// The application you wish to use should be uncommented
//
#define APP_TELEMETRY
//#define APP_C2D
//#define APP_CLI_X509
//#define APP_PROV_X509

// The application you wish to use DHCP mode should be uncommented
#define _DHCP
static wiz_NetInfo g_net_info =
    {
        .mac = {0x00, 0x08, 0xDC, 0x12, 0x34, 0x56}, // MAC address
        .ip = {192, 168, 11, 2},                     // IP address
        .sn = {255, 255, 255, 0},                    // Subnet Mask
        .gw = {192, 168, 11, 1},                     // Gateway
        .dns = {8, 8, 8, 8},                         // DNS server
#ifdef _DHCP
        .dhcp = NETINFO_DHCP // DHCP enable/disable
#else
        // this example uses static IP
        .dhcp = NETINFO_STATIC
#endif
};

Edit the WIZnet-PICO-AZURE-C/exmaples/sample_certs.c entering the proper connection string and key value from the Azure Portal:

/* Paste in the your iothub connection string  */
const char pico_az_connectionString[] = "[device connection string]";

1.2.2. Build

Run make command

(PWD) WIZnet-PICO-AZURE-C/build/examples
$ make
[ 12%] Built target AZURE_SDK_FILES
[ 12%] Built target bs2_default
[ 12%] Built target bs2_default_padded_checksummed_asm
[ 12%] Built target W5100S_FILES
[ 13%] Built target ETHERNET_FILES
[ 13%] Built target DHCP_FILES
[ 13%] Built target DNS_FILES
[ 21%] Built target SNTP_FILES
[ 43%] Built target AZURE_SDK_PORT_FILES
[ 43%] Performing build step for 'ELF2UF2Build'
[100%] Built target elf2uf2
[ 43%] No install step for 'ELF2UF2Build'
[ 43%] Completed 'ELF2UF2Build'
[ 44%] Built target ELF2UF2Build
[ 56%] Built target mbedcrypto
[ 58%] Built target mbedx509
[ 59%] Built target mbedtls
[ 66%] Built target TIMER_FILES
[ 73%] Built target SPI_FILES
Consolidate compiler generated dependencies of target main
[ 75%] Building C object examples/CMakeFiles/main.dir/main.c.obj
[ 75%] Linking CXX executable main.elf
[100%] Built target main

1.2.3. Azure IoT Explorer (preview) setting

To see the message from your IoT Device, you need to make a "Azure IoT Explorer" setting as below:

image

  • In Azure portal, you can get the "Connection String" as follows:

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  • Copy & paste the connection string, and click "Save".

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  • Find the device and click name

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  • Go to "Telemetry" menu, and click "Start"

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  • Wait for incoming message from your IoT device

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1.2.4. Serial terminal open

  • Open "COM" port to see debug code

image

2. Run the example code

2.1. Copy main.uf2 file into your W5x00-EVB-Pico

(PWD) WIZnet-PICO-AZURE-C/build/examples
$ cp main.uf2 /f/

2.2. Serial terminal log

  • Connect to Azure IoT Hub

image

  • Send messages to Azure IoT Hub

image

2.3. Azure IoT Explorer (preview) log

  • Getting device messages from Azure IoT Hub

image