[Ndn-interest] NDN on Arduino proof-of-concept
jburke at remap.UCLA.EDU
Fri Apr 3 16:30:47 PDT 2015
Please see below for proof of concept code showing basic NDN communication on the Arduino! The example publishes an ADC reading with an HMAC in response to an interest with matching name. This uses a new lightweight C++ wrapper around the NDN-CPP C-language core.
We would love to get other contributors involved in this effort and experimenting with the Arduino! There is library work still to be done – for example, this test uses a TCP stack on the Arduino YUN, but we'd like to try some approaches that don't rely on IP, among other things. (Next target is the RFduino<http://www.rfduino.com/> and its BTLE support, hopefully.)
From: "Thompson, Jeff" <jefft0 at remap.ucla.edu<mailto:jefft0 at remap.ucla.edu>>
Date: Fri, 3 Apr 2015 22:59:02 +0000
To: NDN Lib <ndn-lib at lists.cs.ucla.edu<mailto:ndn-lib at lists.cs.ucla.edu>>
Subject: [Ndn-lib] Introducing NDN-CPP Lite
New code has been added to NDN-CPP in GitHub for NDN-CPP Lite, a light-weight C++ layer over the C language core in NDN-CPP.
The main C++ API for NDN-CPP uses the Standard Library classes like std::vector and shared_ptr to automatically manage memory in objects. For data packet encoding, decoding and network transport, the C++ API calls an inner core written in pure C which does not make any assumptions about memory management or support libraries.
Some low-power platforms like an Arduino microcontroller don't support the C++ Standard Library or run-time info for exceptions. To support such platforms, the NDN-CPP Lite API was developed which, like the C core, does not make assumptions about memory management or support libraries. While functionally equivalent to the C core, the NDN-CPP Lite takes advantage of C++ syntax to simplify the API. For example, the following C code initializes a MetaInfo struct:
struct ndn_MetaInfo metaInfo;
The following equivalent NDN-CPP Lite code initializes a MetaInfoLite object:
The MetaInfoLite constructor internally calls the same ndn_MetaInfo_initialize function, but C++ syntax, method overloading and namespace support makes the NDN-CPP Lite code cleaner and less error-prone.
The file examples/arduino/analog-reading/analog-reading.ino<https://github.com/named-data/ndn-cpp/blob/master/examples/arduino/analog-reading/analog-reading.ino> uses NDN-CPP Lite for an Arduino application which registers a prefix, receives an interest over TCP and returns a signed (with HMAC) data packet holding a measurement value. The compiled application is about 28 kilobytes as required by the small microcontroller program space.
For more explanation and sample code, see README-NDN-CPP-Lite.md<https://github.com/named-data/ndn-cpp/blob/master/README-NDN-CPP-Lite.md>. Currently, the NDN-CPP Lite documentation is in the class and method doc comments in include/ndn-cpp/lite<https://github.com/named-data/ndn-cpp/tree/master/include/ndn-cpp/lite>.
- Jeff T
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