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25-serial.js
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25-serial.js
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module.exports = function(RED) {
/*jshint -W082 */
"use strict";
var settings = RED.settings;
var events = require("events");
const { SerialPort } = require('serialport');
var bufMaxSize = 32768; // Max serial buffer size, for inputs...
const serialReconnectTime = settings.serialReconnectTime || 15000;
// TODO: 'serialPool' should be encapsulated in SerialPortNode
// Configuration Node
function SerialPortNode(n) {
RED.nodes.createNode(this,n);
this.serialport = n.serialport;
this.newline = n.newline; /* overloaded: split character, timeout, or character count */
this.addchar = n.addchar || "";
this.serialbaud = parseInt(n.serialbaud) || 57600;
this.databits = parseInt(n.databits) || 8;
this.parity = n.parity || "none";
this.stopbits = parseInt(n.stopbits) || 1;
this.dtr = n.dtr || "none";
this.rts = n.rts || "none";
this.cts = n.cts || "none";
this.dsr = n.dsr || "none";
this.bin = n.bin || "false";
this.out = n.out || "char";
this.enabled = n.enabled || true;
this.waitfor = n.waitfor || "";
this.responsetimeout = n.responsetimeout || 10000;
this.changePort = (serialPort) => {
serialPool.close(this.serialport,() => {});
this.serialport = serialPort.serialport || this.serialport;
this.serialbaud = parseInt(serialPort.serialbaud) || this.serialbaud;
this.databits = parseInt(serialPort.databits) || this.databits;
this.parity = serialPort.parity || this.parity;
this.stopbits = parseInt(serialPort.stopbits) || this.stopbits;
this.dtr = serialPort.dtr || this.dtr;
this.rts = serialPort.rts || this.rts;
this.cts = serialPort.cts || this.cts;
this.dsr = serialPort.dsr || this.dsr;
this.bin = serialPort.bin || this.bin;
this.out = serialPort.out || this.out;
}
}
RED.nodes.registerType("serial-port",SerialPortNode);
// receives msgs and sends them to the serial port
function SerialOutNode(n) {
RED.nodes.createNode(this,n);
this.serialConfig = RED.nodes.getNode(n.serial);
if (!this.serialConfig) {
this.error(RED._("serial.errors.missing-conf"), {});
return;
}
this.serial = n.serial;
var node = this;
node.port = serialPool.get(this.serialConfig);
var serialConfig = this.serialConfig;
this.serialConfig.on('start', function() {
node.port = serialPool.get(serialConfig);
});
node.on("input",function(msg) {
if (msg.hasOwnProperty("baudrate")) {
var baud = parseInt(msg.baudrate);
if (isNaN(baud)) {
node.error(RED._("serial.errors.badbaudrate"),msg);
} else {
node.port.update({baudRate: baud},function(err,res) {
if (err) {
var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
node.error(errmsg,msg);
}
});
}
}
if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
var payload = node.port.encodePayload(msg.payload);
node.port.write(payload,function(err,res) {
if (err) {
var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
node.error(errmsg,msg);
}
});
});
node.port.on('ready', function() {
node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
});
node.port.on('closed', function() {
node.status({fill:"red",shape:"ring",text:"node-red:common.status.not-connected"});
});
node.port.on('stopped', function() {
node.status({fill:"grey",shape:"ring",text:"serial.status.stopped"});
});
}
RED.nodes.registerType("serial out",SerialOutNode);
// receives data from the serial port and emits msgs
function SerialInNode(n) {
RED.nodes.createNode(this,n);
this.serialConfig = RED.nodes.getNode(n.serial);
if (!this.serialConfig) {
this.error(RED._("serial.errors.missing-conf"), {});
return;
}
this.serial = n.serial;
var node = this;
this.serialConfig.on('start', function() {
setCallback(node, node.serialConfig);
});
this.on("close", function(done) {
serialPool.close(this.serialConfig.serialport,done);
});
function setCallback(node) {
node.status({fill:"grey",shape:"dot",text:"node-red:common.status.not-connected"});
node.port = serialPool.get(node.serialConfig);
node.port.on('data', function(msgout) {
node.send(msgout);
});
node.port.on('ready', function() {
node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
});
node.port.on('closed', function() {
node.status({fill:"red",shape:"ring",text:"node-red:common.status.not-connected"});
});
node.port.on('stopped', function() {
node.status({fill:"grey",shape:"ring",text:"serial.status.stopped"});
});
}
setCallback(node)
}
RED.nodes.registerType("serial in",SerialInNode);
// request data and waits for reply
function SerialRequestNode(n) {
RED.nodes.createNode(this,n);
this.serial = n.serial;
this.serialConfig = RED.nodes.getNode(this.serial);
if (this.serialConfig) {
var node = this;
node.port = serialPool.get(this.serialConfig);
// Serial Out
node.on("input",function(msg) {
if (msg.hasOwnProperty("baudrate")) {
var baud = parseInt(msg.baudrate);
if (isNaN(baud)) {
node.error(RED._("serial.errors.badbaudrate"),msg);
} else {
node.port.update({baudRate: baud},function(err,res) {
if (err) {
var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
node.error(errmsg,msg);
}
});
}
}
if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
if (msg.hasOwnProperty("count") && (typeof msg.count === "number") && (node.serialConfig.out === "count")) {
node.serialConfig.newline = msg.count;
}
if (msg.hasOwnProperty("flush") && msg.flush === true) { node.port.serial.flush(); }
node.status({fill:"yellow",shape:"dot",text:"serial.status.waiting"});
node.port.enqueue(msg,node,function(err,res) {
if (err) {
var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
node.error(errmsg,msg);
}
});
});
let serialConfig = this.serialConfig;
serialConfig.on('start', function() {
node.port = serialPool.get(serialConfig);
setCallback(node);
});
// Serial In
function setCallback(node) {
node.port.on('data', function (msgout, sender) {
// serial request will only process incoming data pertaining to its own request (i.e. when it's at the head of the queue)
if (sender !== node) { return; }
node.status({ fill: "green", shape: "dot", text: "node-red:common.status.ok" });
msgout.status = "OK";
node.send(msgout);
});
node.port.on('timeout', function (msgout, sender) {
if (sender !== node) { return; }
msgout.status = "ERR_TIMEOUT";
node.status({ fill: "red", shape: "ring", text: "serial.status.timeout" });
node.send(msgout);
});
node.port.on('ready', function () {
node.status({ fill: "green", shape: "dot", text: "node-red:common.status.connected" });
});
node.port.on('closed', function () {
node.status({ fill: "red", shape: "ring", text: "node-red:common.status.not-connected" });
});
node.port.on('stopped', function() {
node.status({fill:"grey",shape:"ring",text:"serial.status.stopped"});
});
}
setCallback(node);
}
else {
this.error(RED._("serial.errors.missing-conf"), {});
}
this.on("close", function(done) {
if (this.serialConfig) {
serialPool.close(this.serialConfig.serialport,done);
}
else {
done();
}
});
}
RED.nodes.registerType("serial request", SerialRequestNode);
// control node to stop, start, reconfigure ports
function SerialControlNode(n) {
const configProps = [
"serialport", "serialbaud", "databits", "parity", "stopbits",
"dtr", "rts", "cts", "dsr"
]
RED.nodes.createNode(this,n);
this.serialConfig = RED.nodes.getNode(n.serial);
if (!this.serialConfig) {
this.error(RED._("serial.errors.missing-conf"), {});
return;
}
this.serial = n.serial;
var node = this;
node.port = serialPool.get(node.serialConfig);
node.port.on('stopped', function() {
node.status({fill:"grey",shape:"ring",text:"serial.status.stopped"});
});
node.port.on('ready', function() {
node.status({fill:"green",shape:"dot",text:node.serialConfig.serialbaud+","+node.serialConfig.databits+","+(node.serialConfig.parity.toUpperCase().substr(0,1))+","+node.serialConfig.stopbits});
});
node.on("input",function(msg) {
if (msg.hasOwnProperty("flush") && msg.flush === true) { node.port.serial.flush(); }
if (configProps.some((p) => { return msg.payload.hasOwnProperty(p) })) {
msg.payload.enabled = msg.payload.hasOwnProperty('enabled') ? msg.payload.enabled : true;
node.serialConfig.changePort(msg.payload);
}
var stat = {fill:"green",shape:"dot",text:node.serialConfig.serialbaud+","+node.serialConfig.databits+","+(node.serialConfig.parity.toUpperCase().substr(0,1))+","+node.serialConfig.stopbits}
if (msg.payload.hasOwnProperty("enabled")) {
node.serialConfig.enabled = msg.payload.enabled;
if (msg.payload.enabled === true || msg.payload.enabled === "true") {
node.serialConfig.emit('start');
}
else {
serialPool.close(node.serialConfig.serialport,() => {
RED.log.info("[serialconfig:"+node.serialConfig.id+"] " + RED._("serial.stopped",{port:node.serialConfig.serialport}));
});
stat.fill = "grey";
stat.shape = "ring";
}
}
let currentConfig = {};
configProps.map((p) => {
currentConfig[p] = node.serialConfig[p];
});
currentConfig.enabled = node.serialConfig.enabled;
node.status(stat);
node.send({payload:currentConfig});
});
}
RED.nodes.registerType("serial control", SerialControlNode);
var serialPool = (function() {
var connections = {};
return {
get:function(serialConfig) {
// make local copy of configuration -- perhaps not needed?
var port = serialConfig.serialport,
baud = serialConfig.serialbaud,
databits = serialConfig.databits,
parity = serialConfig.parity,
stopbits = serialConfig.stopbits,
dtr = serialConfig.dtr,
rts = serialConfig.rts,
cts = serialConfig.cts,
dsr = serialConfig.dsr,
newline = ""+serialConfig.newline,
spliton = serialConfig.out,
waitfor = serialConfig.waitfor,
binoutput = serialConfig.bin,
addchar = serialConfig.addchar,
responsetimeout = serialConfig.responsetimeout;
var id = port;
// just return the connection object if already have one
// key is the port (file path)
if (connections[id]) { return connections[id]; }
// State variables to be used by the on('data') handler
var i = 0; // position in the buffer
// .newline is misleading as its meaning depends on the split input policy:
// "char" : a msg will be sent after a character with value .newline is received
// "time" : a msg will be sent after .newline milliseconds
// "count" : a msg will be sent after .newline characters
// if we use "count", we already know how big the buffer will be
var bufSize = (spliton === "count") ? Number(newline): bufMaxSize;
waitfor = waitfor.replace("\\n","\n").replace("\\r","\r").replace("\\t","\t").replace("\\e","\e").replace("\\f","\f").replace("\\0","\0"); // jshint ignore:line
if (waitfor.substr(0,2) == "0x") { waitfor = parseInt(waitfor,16); }
if (waitfor.length === 1) { waitfor = waitfor.charCodeAt(0); }
var active = (waitfor === "") ? true : false;
var buf = new Buffer.alloc(bufSize);
var splitc; // split character
// Parse the split character onto a 1-char buffer we can immediately compare against
if (newline.substr(0,2) == "0x") {
splitc = new Buffer.from([newline]);
}
else {
splitc = new Buffer.from(newline.replace("\\n","\n").replace("\\r","\r").replace("\\t","\t").replace("\\e","\e").replace("\\f","\f").replace("\\0","\0")); // jshint ignore:line
}
if (addchar === true) { addchar = splitc; }
addchar = addchar.replace("\\n","\n").replace("\\r","\r").replace("\\t","\t").replace("\\e","\e").replace("\\f","\f").replace("\\0","\0"); // jshint ignore:line
if (addchar.substr(0,2) == "0x") { addchar = new Buffer.from([addchar]); }
connections[id] = (function() {
var obj = {
_emitter: new events.EventEmitter(),
serial: null,
_closing: false,
tout: null,
queue: [],
on: function(a,b) { this._emitter.on(a,b); },
close: function(cb) { this.serial.close(cb); },
encodePayload: function (payload) {
if (!Buffer.isBuffer(payload)) {
if (typeof payload === "object") {
payload = JSON.stringify(payload);
}
else {
payload = payload.toString();
}
if (addchar !== "") { payload += addchar; }
}
else if (addchar !== "") {
payload = Buffer.concat([payload,Buffer.from(addchar)]);
}
return payload;
},
write: function(m,cb) { this.serial.write(m,cb); },
update: function(m,cb) { this.serial.update(m,cb); },
enqueue: function(msg,sender,cb) {
var payload = this.encodePayload(msg.payload);
var qobj = {
sender: sender,
msg: msg,
payload: payload,
cb: cb,
}
this.queue.push(qobj);
// If we're enqueing the first message in line,
// we shall send it right away
if (this.queue.length === 1) {
this.writehead();
}
},
writehead: function() {
if (!this.queue.length) { return; }
var qobj = this.queue[0];
this.write(qobj.payload,qobj.cb);
var msg = qobj.msg;
var timeout = msg.timeout || responsetimeout;
this.tout = setTimeout(function () {
this.tout = null;
var msgout = obj.dequeue() || {};
msgout.port = port;
// if we have some leftover stuff, just send it
if (i !== 0) {
var m = buf.slice(0,i);
m = Buffer.from(m);
i = 0;
if (binoutput !== "bin") { m = m.toString(); }
msgout.payload = m;
}
/* Notify the sender that a timeout occurred */
obj._emitter.emit('timeout',msgout,qobj.sender);
}, timeout);
},
dequeue: function() {
// if we are trying to dequeue stuff from an
// empty queue, that's an unsolicited message
if (!this.queue.length) { return null; }
var msg = Object.assign({}, this.queue[0].msg);
msg = Object.assign(msg, {
request_payload: msg.payload,
request_msgid: msg._msgid,
});
delete msg.payload;
if (this.tout) {
clearTimeout(obj.tout);
obj.tout = null;
}
this.queue.shift();
this.writehead();
return msg;
},
}
//newline = newline.replace("\\n","\n").replace("\\r","\r");
obj._emitter.setMaxListeners(50);
var olderr = "";
var setupSerial = function() {
obj.serial = new SerialPort({
path: port,
baudRate: baud,
dataBits: databits,
parity: parity,
stopBits: stopbits,
//parser: serialp.parsers.raw,
autoOpen: true
}, function(err, results) {
if (err) {
if (err.toString() !== olderr) {
olderr = err.toString();
RED.log.error("[serialconfig:"+serialConfig.id+"] "+RED._("serial.errors.error",{port:port,error:olderr}), {});
}
obj.tout = setTimeout(function() {
setupSerial();
}, serialReconnectTime);
}
});
obj.serial.on('error', function(err) {
RED.log.error("[serialconfig:"+serialConfig.id+"] "+RED._("serial.errors.error",{port:port,error:err.toString()}), {});
obj._emitter.emit('closed');
if (obj.tout) { clearTimeout(obj.tout); }
obj.tout = setTimeout(function() {
setupSerial();
}, serialReconnectTime);
});
obj.serial.on('close', function() {
if (!obj._closing) {
if (olderr !== "unexpected") {
olderr = "unexpected";
RED.log.error("[serialconfig:"+serialConfig.id+"] "+RED._("serial.errors.unexpected-close",{port:port}), {});
}
obj._emitter.emit('closed');
if (obj.tout) { clearTimeout(obj.tout); }
obj.tout = setTimeout(function() {
setupSerial();
}, serialReconnectTime);
}
else {
obj._emitter.emit('stopped');
}
});
obj.serial.on('open',function() {
olderr = "";
RED.log.info("[serialconfig:"+serialConfig.id+"] "+RED._("serial.onopen",{port:port,baud:baud,config: databits+""+parity.charAt(0).toUpperCase()+stopbits}));
// Set flow control pins if necessary. Must be set all in same command.
var flags = {};
if (dtr != "none") { flags.dtr = (dtr!="low"); }
if (rts != "none") { flags.rts = (rts!="low"); }
if (cts != "none") { flags.cts = (cts!="low"); }
if (dsr != "none") { flags.dsr = (dsr!="low"); }
if (dtr != "none" || rts != "none" || cts != "none" || dsr != "none") { obj.serial.set(flags); }
if (obj.tout) { clearTimeout(obj.tout); obj.tout = null; }
//obj.serial.flush();
obj._emitter.emit('ready');
});
obj.serial.on('data',function(d) {
function emitData(data) {
if (active === true) {
var m = Buffer.from(data);
var last_sender = null;
if (obj.queue.length) { last_sender = obj.queue[0].sender; }
if (binoutput !== "bin") { m = m.toString(); }
var msgout = obj.dequeue() || {};
msgout.payload = m;
msgout.port = port;
obj._emitter.emit('data', msgout, last_sender);
}
active = (waitfor === "") ? true : false;
}
for (var z=0; z<d.length; z++) {
var c = d[z];
if (c === waitfor) { active = true; }
if (!active) { continue; }
// handle the trivial case first -- single char buffer
if ((newline === 0)||(newline === "")) {
emitData(new Buffer.from([c]));
continue;
}
// save incoming data into local buffer
buf[i] = c;
i += 1;
// do the timer thing
if (spliton === "time" || spliton === "interbyte") {
// start the timeout at the first character in case of regular timeout
// restart it at the last character of the this event in case of interbyte timeout
if ((spliton === "time" && i === 1) ||
(spliton === "interbyte" && z === d.length-1)) {
// if we had a response timeout set, clear it:
// we'll emit at least 1 character at some point anyway
if (obj.tout) {
clearTimeout(obj.tout);
obj.tout = null;
}
obj.tout = setTimeout(function () {
obj.tout = null;
emitData(buf.slice(0, i));
i=0;
}, newline);
}
}
// count bytes into a buffer...
else if (spliton === "count") {
newline = serialConfig.newline;
if ( i >= parseInt(newline)) {
emitData(buf.slice(0,i));
i=0;
}
}
// look to match char...
else if (spliton === "char") {
if ((c === splitc[0]) || (i === bufMaxSize)) {
emitData(buf.slice(0,i));
i=0;
}
}
}
});
// obj.serial.on("disconnect",function() {
// RED.log.error(RED._("serial.errors.disconnected",{port:port}));
// });
}
setupSerial();
return obj;
}());
return connections[id];
},
close: function(port,done) {
if (connections[port]) {
if (connections[port].tout != null) {
clearTimeout(connections[port].tout);
}
connections[port]._closing = true;
try {
connections[port].close(function() {
RED.log.info(RED._("serial.errors.closed",{port:port}), {});
done();
});
}
catch(err) { }
delete connections[port];
}
else {
done();
}
}
}
}());
RED.httpAdmin.get("/serialports", RED.auth.needsPermission('serial.read'), function(req,res) {
SerialPort.list().then(
ports => {
const a = ports.map(p => p.path);
res.json(a);
},
err => {
res.json([RED._("serial.errors.list")]);
}
)
});
}