Ethernet Shield

Arduino Ethernet Shield

Arduino + Ethernet

Twittering plant

★Wiznet W5100 ethernet chip ★Client ★Server ★TCP ★UDP ★Four channels Capabilities

★All looks like a serial port ★Ethernet: initialise network ★Client: connect to a port on a server, then read() and write() ★Server: waits for a connection on a port The Ethernet library

★DHCP needs 3rd-party library ★No DNS ★DIY for high-level protocols (no HTTP library, etc) - lots of print() statements ★Library memory footprint Ethernet limitations

Practical 1: on the network

Example file: ChatServer Practical 1: on the network

byte mac[] = { 0xDE,0xAD,0xBE,0xEF,0xFE, 0xED }; byte ip[] = { 10, 0, 0, 177 }; byte gateway[] = { 10, 0, 0, 1 }; byte subnet[] = { 255, 255, 0, 0 }; ... Ethernet.begin(mac,ip,gateway,subnet); Configuration

Talking HTTP

$ curl -v http://www.example.com Talking HTTP

$ curl -v http://www.example.com * About to connect() to www.example.com port 80 (#0) * Trying 208.77.188.166... connected * Connected to www.example.com (208.77.188.166) port 80 (#0) Talking HTTP: the request

$ curl -v http://www.example.com * About to connect() to www.example.com port 80 (#0) * Trying 208.77.188.166... connected * Connected to www.example.com (208.77.188.166) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.16.3 > Host: www.example.com > Accept: */* > Talking HTTP: the request

$ curl -v http://www.example.com * About to connect() to www.example.com port 80 (#0) * Trying 208.77.188.166... connected * Connected to www.example.com (208.77.188.166) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.16.3 > Host: www.example.com > Accept: */* > < HTTP/1.1 200 OK < Date: Sun, 16 Aug 2009 16:05:42 GMT < Server: Apache/2.2.3 (Red Hat) < Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT < ETag: "b80f4-1b6-80bfd280" < Accept-Ranges: bytes < Content-Length: 438 < Connection: close < Content-Type: text/html; charset=UTF-8 Talking HTTP: the response

$ curl -v http://www.example.com * About to connect() to www.example.com port 80 (#0) * Trying 208.77.188.166... connected * Connected to www.example.com (208.77.188.166) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.16.3 > Host: www.example.com > Accept: */* > < HTTP/1.1 200 OK < Date: Sun, 16 Aug 2009 16:05:42 GMT < Server: Apache/2.2.3 (Red Hat) < Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT < ETag: "b80f4-1b6-80bfd280" < Accept-Ranges: bytes < Content-Length: 438 < Connection: close < Content-Type: text/html; charset=UTF-8 < <HTML> .......... Talking HTTP: the document

> GET / HTTP/1.1 > Host: www.example.com > < HTTP/1.1 200 OK < Content-Type: text/html; charset=UTF-8 < <HTML> .......... The most important bits

Practical 2: retrieving data

Example file: WebClient Practical 2: retrieving data

★It’s just HTTP ★At least, the good ones are Web APIs

★HTTPS ★Crypto (e.g. OAuth) ★XML parsing ★JSON parsing ★Large documents Web API challenges

Practical 3: serving data

Example file: WebServer Practical 3: serving data

Ethernet Shield

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