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Serial Port JSON Server - Minimal Websocket Client Example
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<!DOCTYPE html> | |
<meta charset="utf-8" /> | |
<title>WebSocket Test</title> | |
<script language="javascript" type="text/javascript"> | |
//var wsUri = "ws://echo.websocket.org/"; | |
var wsUri = "ws://SERVER_IP_ADDRESS:8989/ws"; | |
var output; | |
function init() | |
{ | |
output = document.getElementById("output"); | |
testWebSocket(); | |
} | |
function testWebSocket() | |
{ | |
websocket = new WebSocket(wsUri); | |
websocket.onopen = function(evt) { onOpen(evt) }; | |
websocket.onclose = function(evt) { onClose(evt) }; | |
websocket.onmessage = function(evt) { onMessage(evt) }; | |
websocket.onerror = function(evt) { onError(evt) }; | |
} | |
function onOpen(evt) | |
{ | |
writeToScreen("CONNECTED"); | |
// doSend('list'); | |
// https://github.com/johnlauer/serial-port-json-server/pull/54/files#diff-04c6e90faac2675aa89e2176d2eec7d8R177 | |
// https://github.com/chilipeppr/serial-port-json-server/issues/16 | |
doSend('open /dev/ttyUSB0 9600 8 NONE 1'); | |
} | |
function onClose(evt) | |
{ | |
writeToScreen("DISCONNECTED"); | |
} | |
function onMessage(evt) | |
{ | |
writeToScreen('<span style="color: blue;">RESPONSE: ' + evt.data+'</span>'); | |
//websocket.close(); | |
} | |
function onError(evt) | |
{ | |
writeToScreen('<span style="color: red;">ERROR:</span>' + evt.data); | |
} | |
/* | |
doSend('open /dev/ttyUSB1 9600 8 NONE 1') | |
doSend('sendjson {"Cmd":"Write", "P":"/dev/ttyUSB1","Data":[{"D":"1"}]}') | |
*/ | |
function doSend(message) | |
{ | |
writeToScreen("SENT:" + message); | |
websocket.send(message); | |
} | |
function writeToScreen(message) | |
{ | |
var pre = document.createElement("p"); | |
pre.style.wordWrap = "break-word"; | |
pre.innerHTML = message; | |
//output.prependChild(pre); | |
output.innerHTML = message + "<br>" + output.innerHTML; | |
} | |
window.addEventListener("load", init, false); | |
</script> | |
<h2>WebSocket Test</h2> | |
<div id="output"></div> |
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Cool. Got it working quickly in a Codepen (since that allows non-HTTPS Javascript).
http://codepen.io/jlauer/pen/MJLEzd