mirror of
https://github.com/node-red/node-red-nodes.git
synced 2023-10-10 13:36:58 +02:00
27a1038993
* serial: simplify serialPool.get serialPool.get() has a lot of arguments. Just pass the whole serialConfig object instead. Also introduce early termination to remove one level of indentation. (Just set your diff tool to ignore all whitespace changes to see how very little this patch changes) * serial: move splitting logic onto serialPool All SerialIn and SerialOut nodes for a given port share the same splitting logic as it is indeed set by the common configuration node. Move the code from SerialIn into serialPool so that it can be reused by the serial request node. Notice how the 'data' event will no longer carry single bytes, but the whole payload instead. Also move the output encoding logic into serialPool. * serial: add serial request node Add a "serial request" node to handle simple request/response protocols. This node allows for multiple instances, all sharing the same underlying device. Responses coming from the serial line will only be propagated to the output of the node where the request was originally received (contrary to the "serial in" nodes which all emit the data received from the serial line). Every request received as an input to the node, is transmitted to the serial line, and a matching response must be received before the next one can be transmitted. Any input message received in the meantime is internally enqueued. The node is essentially a merge of serial in and serial out. It shares the same configuration with serial in and serial out for any given port and will not affect the behavior of the existing nodes. This means you can use, alongside with the request node: - as many serial in nodes as you want -- e.g. to "sniff" - serial out to inject mailicious/tampering data onto the serial line, skipping the queueing mechanism * serial request: provide some visual feedback on the node add status indication: - yellow "waiting" when a message is enqueued for sending - green "OK" after an answer is received - red "timeout" after a timeout occurs More sofisticated output would include an indication of the number of messages enqueued and the actual timeout remaining after sending. * serial request: make default response timeout configurable Notice it's a global setting (i.e. stored in the configuration node) as opposed to per-node, but it can be overridden by setting msg.timeout. * serial request: cosmetic changes - added documentation about msg.port - timeout field made wider so to accommodate default value of 10000ms - replaced harcoded text with localizable strings for "waiting" and "timeout" messages * serial: cleanup: remove node.tout this was probably some leftover code from previous implementations. Now all timeouts are handled within the connection objects. * serial: cleanup: set obj.tout to null after clearing it clearing a Timeout without setting it back to null *might* have adverse effects on later code which would check its null-ity. Let's just do it. * serial: cosmetic: add some comments * serial request: fix "split on timeout" case In the case of "split on timeout" case, we're reusing the same .tout for two different purposes: 1) to send a timeout message, in case no answer is received at all [request] 2) to split messages, after receiving the first character [in+request] So in the case of serial request, checking whether .tout is already set is no longer a valid condition for 2). Let's just check whether i === 1, and clear the timeout set up by 1) if it's already there. * serial: add "split on silence" behavior add a fourth logic to split incoming data into messages. The existing "split on timeout" logic starts the timeout upon reception of the first character. This might lead to unwanted behavior if for instance Node-RED is restarted, as data might accumulate into OS buffers (see #410). A different logic might be to only emit a message when enough time has passed, without any new data being received (line silent), a.k.a. interbyte timeout.
430 lines
20 KiB
JavaScript
430 lines
20 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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var settings = RED.settings;
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var events = require("events");
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var serialp = require("serialport");
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var bufMaxSize = 32768; // Max serial buffer size, for inputs...
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// TODO: 'serialPool' should be encapsulated in SerialPortNode
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// Configuration Node
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function SerialPortNode(n) {
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RED.nodes.createNode(this,n);
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this.serialport = n.serialport;
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this.newline = n.newline; /* overloaded: split character, timeout, or character count */
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this.addchar = n.addchar || "false";
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this.serialbaud = parseInt(n.serialbaud) || 57600;
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this.databits = parseInt(n.databits) || 8;
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this.parity = n.parity || "none";
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this.stopbits = parseInt(n.stopbits) || 1;
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this.bin = n.bin || "false";
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this.out = n.out || "char";
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this.responsetimeout = n.responsetimeout || 10000;
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}
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RED.nodes.registerType("serial-port",SerialPortNode);
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// receives msgs and sends them to the serial port
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function SerialOutNode(n) {
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RED.nodes.createNode(this,n);
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this.serial = n.serial;
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this.serialConfig = RED.nodes.getNode(this.serial);
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if (this.serialConfig) {
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var node = this;
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node.port = serialPool.get(this.serialConfig);
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node.on("input",function(msg) {
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if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
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var payload = node.port.encodePayload(msg.payload);
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node.port.write(payload,function(err,res) {
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if (err) {
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var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
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node.error(errmsg,msg);
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}
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});
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});
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node.port.on('ready', function() {
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node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
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});
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node.port.on('closed', function() {
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node.status({fill:"red",shape:"ring",text:"node-red:common.status.not-connected"});
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});
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}
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else {
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this.error(RED._("serial.errors.missing-conf"));
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}
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this.on("close", function(done) {
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if (this.serialConfig) {
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serialPool.close(this.serialConfig.serialport,done);
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}
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else {
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done();
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}
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});
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}
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RED.nodes.registerType("serial out",SerialOutNode);
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// receives data from the serial port and emits msgs
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function SerialInNode(n) {
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RED.nodes.createNode(this,n);
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this.serial = n.serial;
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this.serialConfig = RED.nodes.getNode(this.serial);
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if (this.serialConfig) {
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var node = this;
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node.status({fill:"grey",shape:"dot",text:"node-red:common.status.not-connected"});
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node.port = serialPool.get(this.serialConfig);
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this.port.on('data', function(msgout) {
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node.send(msgout);
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});
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this.port.on('ready', function() {
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node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
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});
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this.port.on('closed', function() {
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node.status({fill:"red",shape:"ring",text:"node-red:common.status.not-connected"});
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});
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}
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else {
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this.error(RED._("serial.errors.missing-conf"));
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}
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this.on("close", function(done) {
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if (this.serialConfig) {
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serialPool.close(this.serialConfig.serialport,done);
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}
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else {
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done();
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}
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});
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}
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RED.nodes.registerType("serial in",SerialInNode);
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/******* REQUEST *********/
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function SerialRequestNode(n) {
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RED.nodes.createNode(this,n);
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this.serial = n.serial;
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this.serialConfig = RED.nodes.getNode(this.serial);
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if (this.serialConfig) {
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var node = this;
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node.port = serialPool.get(this.serialConfig);
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// Serial Out
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node.on("input",function(msg) {
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if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
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node.status({fill:"yellow",shape:"dot",text:"serial.status.waiting"});
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node.port.enqueue(msg,node,function(err,res) {
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if (err) {
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var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
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node.error(errmsg,msg);
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}
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});
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});
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// Serial In
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this.port.on('data', function(msgout, sender) {
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// serial request will only process incoming data pertaining to its own request (i.e. when it's at the head of the queue)
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if (sender !== node) { return; }
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node.status({fill:"green",shape:"dot",text:"node-red:common.status.ok"});
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msgout.status = "OK";
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node.send(msgout);
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});
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this.port.on('timeout', function(msgout, sender) {
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if (sender !== node) { return; }
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msgout.status = "ERR_TIMEOUT";
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node.status({fill:"red",shape:"ring",text:"serial.status.timeout"});
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node.send(msgout);
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});
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// Common part
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node.port.on('ready', function() {
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node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
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});
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node.port.on('closed', function() {
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node.status({fill:"red",shape:"ring",text:"node-red:common.status.not-connected"});
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});
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}
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else {
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this.error(RED._("serial.errors.missing-conf"));
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}
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this.on("close", function(done) {
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if (this.serialConfig) {
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serialPool.close(this.serialConfig.serialport,done);
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}
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else {
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done();
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}
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});
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}
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RED.nodes.registerType("serial request", SerialRequestNode);
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var serialPool = (function() {
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var connections = {};
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return {
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get:function(serialConfig) {
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// make local copy of configuration -- perhaps not needed?
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var port = serialConfig.serialport,
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baud = serialConfig.serialbaud,
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databits = serialConfig.databits,
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parity = serialConfig.parity,
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stopbits = serialConfig.stopbits,
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newline = serialConfig.newline,
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spliton = serialConfig.out,
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binoutput = serialConfig.bin,
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addchar = serialConfig.addchar,
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responsetimeout = serialConfig.responsetimeout;
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var id = port;
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// just return the connection object if already have one
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// key is the port (file path)
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if (connections[id]) { return connections[id]; }
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// State variables to be used by the on('data') handler
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var i = 0; // position in the buffer
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// .newline is misleading as its meaning depends on the split input policy:
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// "char" : a msg will be sent after a character with value .newline is received
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// "time" : a msg will be sent after .newline milliseconds
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// "count" : a msg will be sent after .newline characters
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// if we use "count", we already know how big the buffer will be
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var bufSize = spliton == "count" ? Number(newline): bufMaxSize;
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var buf = new Buffer(bufSize);
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var splitc; // split character
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// Parse the split character onto a 1-char buffer we can immediately compare against
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if (newline.substr(0,2) == "0x") {
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splitc = new Buffer([parseInt(newline)]);
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}
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else {
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splitc = new Buffer(newline.replace("\\n","\n").replace("\\r","\r").replace("\\t","\t").replace("\\e","\e").replace("\\f","\f").replace("\\0","\0")); // jshint ignore:line
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}
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connections[id] = (function() {
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var obj = {
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_emitter: new events.EventEmitter(),
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serial: null,
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_closing: false,
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tout: null,
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queue: [],
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on: function(a,b) { this._emitter.on(a,b); },
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close: function(cb) { this.serial.close(cb); },
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encodePayload: function (payload) {
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if (!Buffer.isBuffer(payload)) {
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if (typeof payload === "object") {
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payload = JSON.stringify(payload);
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}
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else {
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payload = payload.toString();
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}
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if ((spliton === "char") && (addchar === true)) { payload += splitc; }
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}
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else if ((spliton === "char") && (addchar === true) && (splitc !== "")) {
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payload = Buffer.concat([payload,splitc]);
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}
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return payload;
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},
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write: function(m,cb) { this.serial.write(m,cb); },
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enqueue: function(msg,sender,cb) {
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var payload = this.encodePayload(msg.payload);
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var qobj = {
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sender: sender,
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msg: msg,
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payload: payload,
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cb: cb,
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}
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this.queue.push(qobj);
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// If we're enqueing the first message in line,
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// we shall send it right away
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if (this.queue.length === 1) {
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this.writehead();
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}
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},
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writehead: function() {
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if (!this.queue.length) { return; }
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var qobj = this.queue[0];
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this.write(qobj.payload,qobj.cb);
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var msg = qobj.msg;
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var timeout = msg.timeout || responsetimeout;
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this.tout = setTimeout(function () {
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this.tout = null;
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var msgout = obj.dequeue() || {};
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msgout.port = port;
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// if we have some leftover stuff, just send it
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if (i !== 0) {
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var m = buf.slice(0,i);
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m = Buffer.from(m);
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i = 0;
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if (binoutput !== "bin") { m = m.toString(); }
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msgout.payload = m;
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}
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/* Notify the sender that a timeout occurred */
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obj._emitter.emit('timeout',msgout,qobj.sender);
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}, timeout);
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},
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dequeue: function() {
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// if we are trying to dequeue stuff from an
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// empty queue, that's an unsolicited message
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if (!this.queue.length) { return null; }
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var msg = Object.assign({}, this.queue[0].msg);
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msg = Object.assign(msg, {
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request_payload: msg.payload,
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request_msgid: msg._msgid,
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});
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delete msg.payload;
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if (this.tout) {
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clearTimeout(obj.tout);
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obj.tout = null;
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}
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this.queue.shift();
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this.writehead();
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return msg;
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},
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}
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//newline = newline.replace("\\n","\n").replace("\\r","\r");
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var olderr = "";
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var setupSerial = function() {
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obj.serial = new serialp(port,{
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baudRate: baud,
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dataBits: databits,
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parity: parity,
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stopBits: stopbits,
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//parser: serialp.parsers.raw,
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autoOpen: true
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}, function(err, results) {
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if (err) {
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if (err.toString() !== olderr) {
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olderr = err.toString();
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RED.log.error(RED._("serial.errors.error",{port:port,error:olderr}));
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}
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obj.tout = setTimeout(function() {
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setupSerial();
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}, settings.serialReconnectTime);
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}
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});
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obj.serial.on('error', function(err) {
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RED.log.error(RED._("serial.errors.error",{port:port,error:err.toString()}));
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obj._emitter.emit('closed');
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obj.tout = setTimeout(function() {
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setupSerial();
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}, settings.serialReconnectTime);
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});
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obj.serial.on('close', function() {
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if (!obj._closing) {
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RED.log.error(RED._("serial.errors.unexpected-close",{port:port}));
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obj._emitter.emit('closed');
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obj.tout = setTimeout(function() {
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setupSerial();
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}, settings.serialReconnectTime);
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}
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});
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obj.serial.on('open',function() {
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olderr = "";
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RED.log.info(RED._("serial.onopen",{port:port,baud:baud,config: databits+""+parity.charAt(0).toUpperCase()+stopbits}));
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if (obj.tout) { clearTimeout(obj.tout); obj.tout = null; }
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//obj.serial.flush();
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obj._emitter.emit('ready');
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});
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obj.serial.on('data',function(d) {
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function emitData(data) {
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var m = Buffer.from(data);
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var last_sender = null;
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if (obj.queue.length) { last_sender = obj.queue[0].sender; }
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if (binoutput !== "bin") { m = m.toString(); }
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var msgout = obj.dequeue() || {};
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msgout.payload = m;
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msgout.port = port;
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obj._emitter.emit('data',
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msgout,
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last_sender);
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}
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for (var z=0; z<d.length; z++) {
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var c = d[z];
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// handle the trivial case first -- single char buffer
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if ((newline === 0)||(newline === "")) {
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emitData(new Buffer([c]));
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continue;
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}
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// save incoming data into local buffer
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buf[i] = c;
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i += 1;
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// do the timer thing
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if (spliton === "time" || spliton === "interbyte") {
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// start the timeout at the first character in case of regular timeout
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// restart it at the last character of the this event in case of interbyte timeout
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if ((spliton === "time" && i === 1) ||
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(spliton === "interbyte" && z === d.length-1)) {
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// if we had a response timeout set, clear it:
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// we'll emit at least 1 character at some point anyway
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if (obj.tout) {
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clearTimeout(obj.tout);
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obj.tout = null;
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}
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obj.tout = setTimeout(function () {
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obj.tout = null;
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emitData(buf.slice(0, i));
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i=0;
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}, newline);
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}
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}
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// count bytes into a buffer...
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else if (spliton === "count") {
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if ( i >= parseInt(newline)) {
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emitData(buf.slice(0,i));
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i=0;
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}
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}
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// look to match char...
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else if (spliton === "char") {
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if ((c === splitc[0]) || (i === bufMaxSize)) {
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emitData(buf.slice(0,i));
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i=0;
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}
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}
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}
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});
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// obj.serial.on("disconnect",function() {
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// RED.log.error(RED._("serial.errors.disconnected",{port:port}));
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// });
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}
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setupSerial();
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return obj;
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}());
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return connections[id];
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},
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close: function(port,done) {
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if (connections[port]) {
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if (connections[port].tout != null) {
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clearTimeout(connections[port].tout);
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}
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connections[port]._closing = true;
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try {
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connections[port].close(function() {
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RED.log.info(RED._("serial.errors.closed",{port:port}));
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done();
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});
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}
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catch(err) { }
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delete connections[port];
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}
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else {
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done();
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}
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}
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}
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}());
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RED.httpAdmin.get("/serialports", RED.auth.needsPermission('serial.read'), function(req,res) {
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serialp.list(function (err, ports) {
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res.json(ports);
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});
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});
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}
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