CoAP an introduction. SUNET Dagarna i Östersund Robert Olsson UU/KTH
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1 CoAP an introduction SUNET Dagarna i Östersund Robert Olsson UU/KTH
2 History John Ericsson/(Wargentin) Östersund Linux/Kernel/fib_trie.c/pktgen.c/NAPI Zebra/Quagga IRDP/PIM-SM/mBGP Bifrost/Linux workshops WSN/Contiki/Low-Power/Energy SLU/UU/KTH...
3 CoAP/overview Internet-Of-Things (IoT) motivated CoAP (Constrained Application Protocol) IETF standard (draft-14) Shelby/Sensinode(fi), Hartke, Bormann. U. Bremen
4 CoAP/overview Machine-to-Machine possible (M2M) Very small footprint, RAM, ROM URI (Uniform Resource Identifier) User-agent/plugin for Firefox Copper (Cu), ETH ETSI test (2012)
5 CoAP/overview RESTful client-server. Compare http: Resource Discovery UDP Reliable unicast Best effort multicast Proxy and Caching is simple
6 CoAP/message types Comfirmable message Non-comfirmable message Ack message Reset message Piggy-backed Seprate
7 CoAP/transport Default UDP but required DTLS (Datagram TLS) TCP SCTP is discussed UDP Port 5683 (mandatory) UDP Ports compressed 6lowPAN
8 CoAP/protocol 4 byte header Options Payload uint (unsigned integer) string opague Endpoint IP addr, UDP port
9 CoAP/protocol header Ver T OC Code Message ID Options (if any) Payload (if any) Figure 7: Message Format 3.1. Header Format The fields in the header are defined as follows: Version (Ver): 2-bit unsigned integer. Indicates the CoAP version number. Implementations of this specification MUST set this field to 1. Other values are reserved for future versions. Type (T): 2-bit unsigned integer. Indicates if this message is of type Confirmable (0), Non-Confirmable (1), Acknowledgement (2) or Reset (3). See Section 4 for the semantics of these message types. Option Count (OC): 4-bit unsigned integer. Indicates the number of options after the header (0-14). If set to 0, there are no options and the payload (if any) immediately follows the header. If set to 15, then an end-of-options marker is used to indicate the end of options and the start of the payload. The format of options is defined below.
10 CoAP/pkt-size Message size Must fit in a single IP datagram Default MTU 1280 bytes 6LOWPAN 127 bytes WSN based on IEEE bytes
11 CoAP/RESTful CoAP Request/Response semantics GET, POST, PUT, DELETE Easy to map to HTTP Cache and Proxy possible
12 CoAP/URI coap URI: coap://example.se:5683/~sensors./temp1.xml coaps URI: coaps://mypan.se/bike/lock
13 CoAP/Secure DTLS (Datagram TLS) RFC4347 IPSEC alternative Area for work... Key sharing problems Resource problems Cerificate problems
14 CoAP/implementations Contiki-2.6 / Erbium ETH Zurich 8.5 kb ROM 1.5 kb RAM Linux libcoap TinyOs (libcoap) Firefox CoAP Copper Cu plugin install an test. Wikipedia has an upated list. Check it!
15 CoAP/example Client Server > Header: GET (T=CON, Code=1, MID=0x7d34) GET Uri-Path: "temperature" < Header: 2.05 Content (T=ACK, Code=69, MID=0x7d34) 2.05 Payload: "22.3 C" GET=1 MID=0x7d "temperature" (11 B) =69 MID=0x7d "22.3 C" (6 B) Figure 16: Confirmable request; piggy-backed response
16 CoAP/additional standards Blockwise transfers in CoAP ( bytes) draft-ietf-core-block-10 CoRE Link Format (GET /.well known/core) draft-shelby-core-link-format-14 Observing Resources in CoAP (Observe option) draft-ietf-core-observe-07
17 CoAP/progamming Write plain C-code. Socket programming libcoap Both ways needs some knowledge about CoAP protocol Within MCU OS'es like Contiki or TinyOs etc..
18 References The Contiki OS. draft-ietf-core-coap-12 draft-ietf-core-block-10 draft-ietf-core-observe-07 draft-ietf-core-link-format-14 M. Kovatsch, S. Duquennoy, and A. Dunkels, A Low-Power CoAP for Contikiâ in Mobile Adhoc and Sensor Systems (MASS), 2011 IEEE 8th International Conference on, 2011, pp , DOI: /MASS LowPAN, Zach Shelby, Carsten Borman (2009) IANA: RFCUniform Resource Identifier (URI) Schemes. [RFC4395] Nanoservice. Sensinode.Security Whitepaper R. Olsson and J. Laas, Sensd.
19 IoT-grid control unit ARM Bidir. Step-Up/down-DC-DC converter/contiki/coap/ethetnet
20 IoT-grid/CoAP app.
21 22Watt/DC router/700kpps/4sfp Low-power rugged router w. passive cooling and power options Made in Sweden, Powered by Bifrost/Linux
22 Ultracapacitor Effort Ultra-Capacitor bank with Farad
23 Router upgrade/serengeti
24 Questions
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