{"id":1432,"date":"2019-09-28T07:55:09","date_gmt":"2019-09-28T07:55:09","guid":{"rendered":"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/?p=1432"},"modified":"2020-05-02T22:25:43","modified_gmt":"2020-05-02T22:25:43","slug":"explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4","status":"publish","type":"post","link":"https:\/\/www.petecodes.co.uk\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4\/","title":{"rendered":"Explorations in Dot Net Core 3.0 for Raspberry Pi &#8211; Part 4"},"content":{"rendered":"\n<p style=\"background-color:#e2ddc6\" class=\"has-background\"><em>This is part 4 of a (at least) 5 part blog series on Dot Net Core on the Raspberry Pi&#8230;.<\/em><br><br><em>You can see <a rel=\"noreferrer noopener\" href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi\/\" target=\"_blank\">Part 1 &#8211; Installation and Hello World &#8211; right here<\/a>&#8230; <\/em><br><em>You can see <a rel=\"noreferrer noopener\" href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-2\/\" target=\"_blank\">Part 2 &#8211; GPIO &#8211; right here<\/a>&#8230; <\/em> <br><em>You can see <\/em><a rel=\"noreferrer noopener\" href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-3\/\" target=\"_blank\"><em>Part 3 &#8211; Sending Azure IoT Hub Messages &#8211; right here&#8230;<\/em><\/a> <br><em>You can see <a href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-5\/\">Part 5 &#8211; Remote Deployment and Debugging &#8211; right here&#8230;<\/a><\/em>   <\/p>\n\n\n\n<p><a href=\"https:\/\/devblogs.microsoft.com\/dotnet\/announcing-net-core-3-0\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (opens in a new tab)\">On September 25th 2019<\/a>, the Dot Net Team released version 3.0 of the Dot Net Core Framework at <a rel=\"noreferrer noopener\" aria-label=\" (opens in a new tab)\" href=\"https:\/\/www.dotnetconf.net\/\" target=\"_blank\">.Net Conf.<\/a><\/p>\n\n\n\n<p>To join in the fun, I held a special with <a rel=\"noreferrer noopener\" aria-label=\"Notts IoT (opens in a new tab)\" href=\"https:\/\/www.nottsiot.co.uk\/\" target=\"_blank\">Notts IoT<\/a>, the IoT group I organise in Nottingham, where I gave a talk on <a rel=\"noreferrer noopener\" href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/pete_talk\/dot-net-core-3-0-on-the-raspberry-pi\/\" target=\"_blank\">Dot Net Core 3.0 on the Raspberry Pi.<\/a> <\/p>\n\n\n\n<p>This blog post is what I&#8217;ve learnt along the way to preparing for the talk as well as afterwards&#8230;! <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Previously on Pete Codes&#8230;<\/h2>\n\n\n\n<p>In <a href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-3\/\">the last blog post<\/a> we&#8217;d created a Console app that read the status of a button and sent a message to an Azure IoT Hub.<\/p>\n\n\n\n<p>In this post we&#8217;ll add code to allow us to receive a message back from our IoT Hub that we send from the Microsoft IoT Device Explorer. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What you&#8217;ll need <\/h2>\n\n\n\n<ul><li>You&#8217;ll need to have completed the steps in the previous blog post &#8211; <a href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-3\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (opens in a new tab)\">Read that here<\/a><\/li><li>You&#8217;ll need an Azure subscription &#8211; <a rel=\"noreferrer noopener\" aria-label=\"Grab a trial here (opens in a new tab)\" href=\"https:\/\/azure.microsoft.com\/en-gb\/free\/\" target=\"_blank\">Grab a trial here<\/a><\/li><li>You&#8217;ll need the Azure IoT Device Explorer &#8211; <a rel=\"noreferrer noopener\" aria-label=\"Get it here (opens in a new tab)\" href=\"https:\/\/aka.ms\/aziotdevexp\" target=\"_blank\">Get it here<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Putting even more &#8220;I&#8221; in IoT<\/h2>\n\n\n\n<p>If you&#8217;ve followed along with the previous blog, you&#8217;ll already have installed the Dot Net Core 3.0 binaries and runtimes, and have a console app running that flashes an LED and sends a message to an IoT Hub when you press a button.<\/p>\n\n\n\n<p>Our next step is to write some code which receives messages from the IoT Hub. We can send these messages through the hub using our Azure Device Explorer<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Listen up friend<\/h2>\n\n\n\n<p>Let&#8217;s add a subroutine and some code that will listen for messages from the IoT Hub.<\/p>\n\n\n\n<p>Create the following subroutine beneath our existing SendDeviceToCloudMessageAsync subroutine;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private static async void ReceiveCloudToDeviceMessageAsync()\n{\n            \n}<\/code><\/pre>\n\n\n\n<p>We&#8217;ll add a Console.WriteLine first so that we know our sub has been called successfully;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Console.WriteLine(\"Receiving Cloud to Device messages from IoT Hub\");<\/code><\/pre>\n\n\n\n<p>Next we&#8217;ll sit in a loop waiting for a message to be received from the IoT Hub&#8230; This is safe to do because we&#8217;re using an Asynchronous Subroutine. This way the rest of the code will continue. Add the following while loop to the subroutine;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>while (true)\n{\n}<\/code><\/pre>\n\n\n\n<p>Next we need to try receiving a Message from the IoT Hub&#8230; We do this by calling the <a href=\"https:\/\/docs.microsoft.com\/en-us\/dotnet\/api\/microsoft.azure.devices.client.deviceclient.receiveasync?view=azure-dotnet\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Device Client ReceiveAsync method (opens in a new tab)\">Device Client ReceiveAsync method<\/a>. Add the following to the while loop;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Message receivedMessage = await deviceClient.ReceiveAsync();<\/code><\/pre>\n\n\n\n<p>If we don&#8217;t actually receive any messages from the IoT Hub, the above call will return a Null. So we need to check for this before doing anything else. Add the following below the ReceiveAsync call;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (receivedMessage != null) \n{\n}<\/code><\/pre>\n\n\n\n<p>Next, assuming that we&#8217;ve received a valid message from the IoT Hub, we can decode that message in a similair way to how we encoded the message string when we were sending a message to the IoT Hub&#8230; Add the following within the if statement which will convert the IoT Hub message into an ASCII String;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>string receivedMessageString = Encoding.ASCII.GetString(receivedMessage.GetBytes());<\/code><\/pre>\n\n\n\n<p>We can now spit our message out to the console so we know we&#8217;ve received it;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Console.WriteLine(\"Received message: {0}\", receivedMessageString);<\/code><\/pre>\n\n\n\n<p>Next we need to tell the IoT Hub that we&#8217;ve received the message successfully. We do this by calling the <a href=\"https:\/\/docs.microsoft.com\/en-us\/dotnet\/api\/microsoft.azure.devices.client.deviceclient.completeasync?view=azure-dotnet\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Device Client CompleteAsync method (opens in a new tab)\">Device Client CompleteAsync method<\/a> on our Device Client;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>await deviceClient.CompleteAsync(receivedMessage);<\/code><\/pre>\n\n\n\n<p>When the IoT Hub receives the Complete Acknowledgement it sets the message to completed, which in effect deletes the message we received from the Cloud to Device Queue. You can <a rel=\"noreferrer noopener\" aria-label=\"read more about how the Cloud to Device Queue on the Microsoft Docs Website here (opens in a new tab)\" href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/iot-hub\/iot-hub-devguide-messages-c2d\" target=\"_blank\">read more about how the Cloud to Device Queue on the Microsoft Docs Website<\/a>.<\/p>\n\n\n\n<p>The finished subroutine should now look like;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private static async void ReceiveCloudToDeviceMessageAsync()\n{\n    Console.WriteLine(\"Receiving Cloud to Device messages from IoT Hub\");\n\n    while (true)\n    {\n        Message receivedMessage = await deviceClient.ReceiveAsync();\n                \n        if (receivedMessage != null) \n        {\n            string receivedMessageString = Encoding.ASCII.GetString(receivedMessage.GetBytes());\n            Console.WriteLine(\"Received message: {0}\", receivedMessageString);\n            await deviceClient.CompleteAsync(receivedMessage);\n        }\n                \n    }\n}<\/code><\/pre>\n\n\n\n<p>Finally we need to kick our subroutine off. After our initial Hello World Console WriteLine we can add a call to the subroutine;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ReceiveCloudToDeviceMessageAsync();<\/code><\/pre>\n\n\n\n<p>The finished code should now look like;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>using System;\nusing System.Device.Gpio;\nusing Microsoft.Azure.Devices.Client;\nusing System.Text;\n\nnamespace rpitest\n{\n    class Program\n    {\n\n        private static readonly string connectionString = \"[Connnection String]\";\n        private static DeviceClient deviceClient;\n\n        static void Main(string[] args)\n        {\n            Console.WriteLine(\"Hello World!\");\n\n            deviceClient = DeviceClient.CreateFromConnectionString(connectionString);\n            \n            ReceiveCloudToDeviceMessageAsync();\n\n            GpioController controller = new GpioController(PinNumberingScheme.Board);\n            var pin = 10;\n            var buttonPin = 26;\n            var buttonPressed = false;\n            \n            controller.OpenPin(pin, PinMode.Output);\n            controller.OpenPin(buttonPin, PinMode.InputPullUp);            \n\n            try\n            {\n                while (true)\n                {\n                    if (controller.Read(buttonPin) == false)\n                    {\n                        controller.Write(pin, PinValue.High);\n\n                        if (buttonPressed == false)\n                        {\n                            buttonPressed = true;\n                            SendDeviceToCloudMessageAsync();\n                        }\n                    }\n                    else\n                    {\n                        controller.Write(pin, PinValue.Low);\n                        buttonPressed = false;\n                    }\n                }\n            }\n            finally\n            {\n                controller.ClosePin(pin);\n            }\n        }\n\n        private static async void SendDeviceToCloudMessageAsync()\n        {\n            var messageString = \"Button Pressed\";\n            Message message = new Message(Encoding.ASCII.GetBytes(messageString));\n\n            message.Properties.Add(\"buttonEvent\", \"true\");\n\n            await deviceClient.SendEventAsync(message);\n            Console.WriteLine(\"Sending Message {0}\", messageString);\n\n        }\n\n        private static async void ReceiveCloudToDeviceMessageAsync()\n        {\n            Console.WriteLine(\"Receiving Cloud to Device messages from IoT Hub\");\n\n            while (true)\n            {\n                Message receivedMessage = await deviceClient.ReceiveAsync();\n                \n                if (receivedMessage != null) \n                {\n                    string receivedMessageString = Encoding.ASCII.GetString(receivedMessage.GetBytes());\n                    Console.WriteLine(\"Received message: {0}\", receivedMessageString);\n                    await deviceClient.CompleteAsync(receivedMessage);\n                }\n                \n            }\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>We can now run the latest version of the application;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>dotnet run<\/code><\/pre>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" width=\"990\" height=\"576\" src=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/wp-content\/uploads\/2019\/09\/image-45.png\" alt=\"\" class=\"wp-image-1440\" srcset=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-45.png 990w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-45-300x175.png 300w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-45-768x447.png 768w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-45-350x204.png 350w\" sizes=\"(max-width: 990px) 100vw, 990px\" \/><figcaption>Console App waiting for Cloud to Device Message<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Return to the Device Explorer<\/h2>\n\n\n\n<p>If we now open the Device Explorer Application again and click the &#8220;Messages to Device&#8221; tab;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"786\" height=\"678\" src=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/wp-content\/uploads\/2019\/09\/image-46.png\" alt=\"\" class=\"wp-image-1441\" srcset=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-46.png 786w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-46-300x259.png 300w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-46-768x662.png 768w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-46-350x302.png 350w\" sizes=\"(max-width: 786px) 100vw, 786px\" \/><figcaption>Device Explorer &#8220;Message to Device&#8221; tab<\/figcaption><\/figure><\/div>\n\n\n\n<p>Make sure that the IoT Hub and Device ID dropdowns have got the right information in them.<\/p>\n\n\n\n<p>Now enter a message into the &#8220;Message&#8221; box and press the &#8220;Send&#8221; Button;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"786\" height=\"678\" src=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/wp-content\/uploads\/2019\/09\/image-47.png\" alt=\"\" class=\"wp-image-1442\" srcset=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-47.png 786w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-47-300x259.png 300w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-47-768x662.png 768w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-47-350x302.png 350w\" sizes=\"(max-width: 786px) 100vw, 786px\" \/><figcaption>Sent Cloud Message to Device<\/figcaption><\/figure><\/div>\n\n\n\n<p>You should then see our Message appearing in the console of our app;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"486\" src=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/wp-content\/uploads\/2019\/09\/image-48-1024x486.png\" alt=\"\" class=\"wp-image-1443\" srcset=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-1024x486.png 1024w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-300x142.png 300w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-768x365.png 768w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-1536x729.png 1536w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-2048x972.png 2048w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-1600x759.png 1600w, https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/image-48-350x166.png 350w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>Cloud to Device Message received <\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Next Time<\/h2>\n\n\n\n<p>In the next post we&#8217;ll switch to using our main Development PC to code on, remotely deploying and debugging code direct from VS Code.<\/p>\n\n\n\n<div class=\"wp-block-coblocks-row coblocks-row-4222221263\" data-columns=\"2\" data-layout=\"50-50\"><div class=\"wp-block-coblocks-row__inner has-background has-medium-gutter has-padding has-medium-padding has-no-margin is-stacked-on-mobile\" style=\"background-color:#e2ddc6\">\n<div class=\"wp-block-coblocks-column coblocks-column-42222219279\" style=\"width:50%\"><div class=\"wp-block-coblocks-column__inner has-no-padding has-no-margin\">\n<p><strong><em><a href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi\/\">&lt; Part 3 &#8211; Azure IoT<\/a><\/em><\/strong><\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-coblocks-column has-text-align-right coblocks-column-42222219287\" style=\"width:50%\"><div class=\"wp-block-coblocks-column__inner has-no-padding has-no-margin\">\n<p class=\"has-text-align-right\"><strong><em><a href=\"https:\/\/wordpress-634681-2064240.cloudwaysapps.com\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-3\/\">Part 5 &#8211; Remote Deployment<\/a><\/em><\/strong> ><\/p>\n<\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This is part 4 of a (at least) 5 part blog series on Dot Net Core on the Raspberry Pi&#8230;.&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1460,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[5],"tags":[12,14,11,13],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Explorations in Dot Net Core 3.0 for Raspberry Pi - Part 4 - Pete Codes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.petecodes.co.uk\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Explorations in Dot Net Core 3.0 for Raspberry Pi - Part 4 - Pete Codes\" \/>\n<meta property=\"og:description\" content=\"This is part 4 of a (at least) 5 part blog series on Dot Net Core on the Raspberry Pi&#8230;.&hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.petecodes.co.uk\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4\/\" \/>\n<meta property=\"og:site_name\" content=\"Pete Codes\" \/>\n<meta property=\"article:published_time\" content=\"2019-09-28T07:55:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-05-02T22:25:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/azureiothub3-twitter-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1106\" \/>\n\t<meta property=\"og:image:height\" content=\"512\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"PeteCodes\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Dot Net Core 3 with Raspberry Pi - Cloud to Device Messages\" \/>\n<meta name=\"twitter:description\" content=\"In the next part of my series on Dot Net Core 3 with Raspberry Pi, we add code to receive Cloud to Device Messages,\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.petecodes.co.uk\/wp-content\/uploads\/2019\/09\/azureiothub3-twitter-1.png\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"PeteCodes\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.petecodes.co.uk\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.petecodes.co.uk\/explorations-in-dot-net-core-3-0-for-raspberry-pi-part-4\/\"},\"author\":{\"name\":\"PeteCodes\",\"@id\":\"https:\/\/www.petecodes.co.uk\/#\/schema\/person\/c2f636f242b064676ae61ed0022b32e7\"},\"headline\":\"Explorations in Dot Net Core 3.0 for Raspberry Pi &#8211; 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