.. zephyr:code-sample:: mqtt-azure :name: Microsoft Azure IoT Hub MQTT :relevant-api: bsd_sockets mqtt_socket tls_credentials random_api Connect to Azure IoT Hub and publish messages using MQTT. Overview ******** This sample application demonstrates how an MQTT client can publish messages to an Azure Cloud IoT hub based on MQTT protocol. - Acquire a DHCPv4 lease - Establish a TLS connection with Azure Cloud IoT hub - Publish data to the Azure cloud - SOCKS5 supported - DNS supported The source code of this sample application can be found at: :zephyr_file:`samples/net/cloud/mqtt_azure`. Requirements ************ - Azure Cloud account - Azure IOT Cloud credentials and required information - Freedom Board (FRDM-K64F) - Network connectivity Building and Running ******************** This application has been built and tested on the NXP FRDMK64F. Certs are required to authenticate to the Azure Cloud IoT hub. Current certs in :zephyr_file:`samples/net/cloud/mqtt_azure/src/digicert.cer` are copied from ``_ Configure the following Kconfig options based on your Azure Cloud IoT Hub in your own overlay config file: - SAMPLE_CLOUD_AZURE_USERNAME - Username field use:: {iothubhostname}/{device_id}/?api-version=2018-06-30, where ``{iothubhostname}`` is the full CName of the IoT hub. - SAMPLE_CLOUD_AZURE_PASSWORD - Password field, use an SAS token. - SAMPLE_CLOUD_AZURE_CLIENT_ID - ClientId field, use the deviceId. - SAMPLE_CLOUD_AZURE_HOSTNAME - IoT hub hostname - SAMPLE_CLOUD_AZURE_SERVER_ADDR - IP address of the Azure MQTT broker - SAMPLE_CLOUD_AZURE_SERVER_PORT - Port number of the Azure MQTT broker You'll also need to set these Kconfig options if you're running the sample behind a proxy: - SAMPLE_SOCKS_ADDR - IP address of SOCKS5 Proxy server - SAMPLE_SOCKS_PORT - Port number of SOCKS5 Proxy server On your Linux host computer, open a terminal window, locate the source code of this sample application (i.e., :zephyr_file:`samples/net/cloud/mqtt_azure`) and type: .. zephyr-app-commands:: :zephyr-app: samples/net/cloud/mqtt_azure :board: frdm_k64f :conf: "prj.conf " :goals: build flash :compact: Also this application can be tested with QEMU. This is described in :ref:`networking_with_qemu`. Set up Zephyr and NAT/masquerading on host to access Internet and use :file:`overlay-qemu_x86.conf`. DHCP support is not enabled with QEMU. It uses static IP addresses. Sample overlay file =================== This is the overlay template for Azure IoT hub and other details: .. code-block:: console CONFIG_SAMPLE_CLOUD_AZURE_USERNAME="" CONFIG_SAMPLE_CLOUD_AZURE_PASSWORD="" CONFIG_SAMPLE_CLOUD_AZURE_CLIENT_ID="" CONFIG_SAMPLE_CLOUD_AZURE_HOSTNAME="" CONFIG_SAMPLE_SOCKS_ADDR="" CONFIG_SAMPLE_SOCKS_PORT= CONFIG_SAMPLE_CLOUD_AZURE_SERVER_ADDR="" CONFIG_SAMPLE_CLOUD_AZURE_SERVER_PORT= Sample output ============= This is the output from the FRDM UART console, with: .. code-block:: console [00:00:03.001,000] eth_mcux: Enabled 100M full-duplex mode. [00:00:03.010,000] mqtt_azure.main: Waiting for network to setup... [00:00:03.115,000] net_dhcpv4: Received: 10.0.0.2 [00:00:03.124,000] net_config: IPv4 address: 10.0.0.2 [00:00:03.132,000] net_config: Lease time: 43200 seconds [00:00:03.140,000] net_config: Subnet: 255.255.255.0 [00:00:03.149,000] net_config: Router: 10.0.0.10 [00:00:06.157,000] mqtt_azure.try_to_connect: attempting to connect... [00:00:06.167,000] net_sock_tls.tls_alloc: (0x200024f8): Allocated TLS context, 0x20001110 [00:00:19.412,000] mqtt_azure.mqtt_event_handler: MQTT client connected! [00:00:19.424,000] mqtt_azure.publish_message: mqtt_publish OK [00:00:19.830,000] mqtt_azure.mqtt_event_handler: PUBACK packet id: 63387 [00:00:31.842,000] mqtt_azure.publish_message: mqtt_publish OK [00:00:51.852,000] mqtt_azure.publish_message: mqtt_publish OK [00:00:51.861,000] mqtt_azure.mqtt_event_handler: PUBACK packet id: 38106 You can also check events or messages information on Azure Portal. Cloud to device communication ============================= Goto IoT devices section in Azure Portal. Click on the device from IoT devices. If you have configured multiple devices, select correct device. Goto Message to Device section. Enter text in Message Body section. Click on Send Message. See `Azure Cloud MQTT Documentation `_.