Link Arduino to Nodejs, reliably. Can automatically connect to devices in a given folder and detect new devices. Linux-only, since it manages serial settings through stty.
Run npm install git://github.com/Densaugeo/Skirnir.git or add git://github.com/Densaugeo/Skirnir.git to your package.json dependencies.
Add contents of src/ to your project folder and `#include "Skirnir.hpp" in your main .cpp file.
Minimal code to automatically connect to any device found in /dev, send [1, 2, 3], and log any response (messages will be padded with zeroes, because Skirnir packets always carry 45 bytes of data):
var Skirnir = require('skirnir');
var skirnir = new Skirnir({dir: '/dev', autoscan: true, autoadd: true});
setInterval(function() {
for(var i in skirnir.connections) {
skirnir.connections[i].send(new Buffer([1, 2, 3]));
}
}, 1000);
skirnir.on('message', function(e) {
console.log(new Buffer(e.data));
});
The following minimal code can maintain a connection and echo received packets back to the PC:
#include "Skirnir.hpp"
unsigned char packet_decoded[45];
uint16_t last_ping = 0;
Skirnir a_skirnir = Skirnir(&Serial);
void setup() {
Serial.begin(9600);
}
void loop() {
// Start heartbeat every 2s
if((uint16_t) millis() - last_ping > 2000) {
last_ping = millis();
a_skirnir.heartbeat();
}
// Returns true if a valid packet is found
if(a_skirnir.receive_until_packet(packet_decoded)) {
// Echo packet back to PC
a_skirnir.send45(packet_decoded);
}
}
Normally, Skirnir sends data in 45-byte packets, and ignores extra data if trying to .send() more than 45 bytes. The Skirnir180 class works the same as Skirnir, but is also able to send 180-byte packets, at the cost of a couple hundred bytes of memory. Skirnir180::send() will still send smaller payloads in the same 45-byte packets as Skirnir::send().
LGPL