Monthly Archives: September 2013

CoAP Server for Block Transfer Using PUT

How to Write a Server that uses Block Transfer to Receive Data from Client using PUT Option Before you try out this sample, we suggest that you go through the CoAP block transfer draft or at-least read the primer of Block Transfer Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 […]

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CoAP Client for Block Transfer using PUT

How to Write a Client that uses Block Transfer to Send Data to Server using PUT Option Before you try out this sample, we suggest that you go through the CoAP block transfer draft or at-least read the primer of Block Transfer Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 […]

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CoAP Block Transfer

Transferring Large Data in Smaller Block Given that CoAP is designed for small devices, we need to put reasonable restrictions on the size of the payload and the message to ensure fragmentation is avoided during transfer and also there is limited processing need at the machine end. But sometimes, it might become necessary to transfer […]

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Client that Supports Observable Option

How to Write a Client that Supports the Observe Option Before you try out this sample, we suggest that you go through the CoAP observe draft or at-least read the primer of Observable Option. Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 or higher (even an express edition will do) This […]

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The CoAP Observable Resource

The concept of notifications in CoAP Sometimes, there are sensor values that change over a period of time (e.g. temperature, pressure). Now, if you look at pre-HTML 5 days of Ajax, the client needs to send a request to get the latest value. In CoAP, the notion of “notifications” is introduced. A client can request […]

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Server that Supports Observable Option

How to Write a Server that Supports Observe Option Before you try out this sample, we suggest that you go through the CoAP observe draft or at-least read the primer of Observable Option. Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 or higher (even an express edition will do) This […]

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CoAP Client that Receives Separate Response

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How to Handle Separate Response on Client Side We are assuming that you are familiar with the concept of “Separate Response”. If not, please read the CoAP specification, or at-least the primer tutorial. Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 or higher (even an express edition will do) This tutorial […]

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CoAP Server that Sends Separate Response

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Sending Separate Response to Client We are assuming that you are familiar with the concept of “Separate Response”. If not, please read the CoAP specification, or at-least the primer tutorial. Pre-Requisites: You need Microsoft .NET Micro Framework 4.2 You need Visual Studio 2010 or higher (even an express edition will do) This tutorial will use […]

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The CoAP Separate Response

Getting the Response Back After a While As outlined in previous posts, CoAP is a simple request/response mechanism. For a given request, based on the type of the request, there might be a response. Sometimes, if the server is not able to respond immediately to a CON request , it simply responds with an Empty ACK message […]

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CoAP Client that Sends CON Requests

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How to Send CON Requests from Client A CON request in CoAP mandates that the recipient must provide a response. There are rules for receiver and sender. Since we are focusing on client, that will send the CON request, we will focus only on sender rules. See the server sample for recipient rules. By definition, […]

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