modbus-serial
Version:
A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.
212 lines (196 loc) • 9.4 kB
JavaScript
;
/* eslint-disable no-undef */
const expect = require("chai").expect;
const mockery = require("mockery");
const LONG_MSG = "010380018301830183018301830183018301830183018301830183018301830\
1830183018301830183018301830183018301830183018301830183018301830183018301830183\
0183018301830183018301830183018301830183018301830183018301830183018301830183018\
3018301830183018301830183018301830183018346e0";
describe("Modbus Telnet port", function() {
let port;
before(function() {
const mock = require("./../mocks/netMock");
mockery.resetCache();
mockery.enable({ warnOnReplace: false, useCleanCache: true, warnOnUnregistered: false });
mockery.registerMock("net", mock);
const TelnetPort = require("./../../ports/telnetport");
port = new TelnetPort("127.0.0.1", { port: 9999 });
});
after(function() {
mockery.disable();
});
afterEach(function() {
port.close();
});
describe("#isOpen", function() {
it("should not be open before #open", function() {
expect(port.isOpen).to.be.false;
});
it("should be open after #open", function(done) {
port.open(function() {
expect(port.isOpen).to.be.true;
done();
});
});
it("should not be open after #close", function(done) {
port.open(function() {
port.close(function() {
expect(port.isOpen).to.be.false;
done();
});
});
});
it("should be able to be destroyed after opening", function(done) {
port.open(function() {
port.destroy(function() {
setTimeout(function() {
expect(port.isOpen).to.be.false;
done();
});
});
});
});
it("should not be closed on timeout", function(done) {
port.open(function() {
expect(port.isOpen).to.be.true;
port.emit("timeout");
expect(port.isOpen).to.be.true;
done();
});
});
});
describe("data handler", function() {
it("should return a valid Modbus RTU message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("11", "hex"));
port._client.receive(Buffer.from("03", "hex"));
port._client.receive(Buffer.from("06", "hex"));
port._client.receive(Buffer.from("ae", "hex"));
port._client.receive(Buffer.from("41", "hex"));
port._client.receive(Buffer.from("56", "hex"));
port._client.receive(Buffer.from("52", "hex"));
port._client.receive(Buffer.from("43", "hex"));
port._client.receive(Buffer.from("40", "hex"));
port._client.receive(Buffer.from("49", "hex"));
port._client.receive(Buffer.from("ad", "hex"));
});
});
});
it("should return a valid Modbus RTU exception", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("1183044136");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("11", "hex"));
port._client.receive(Buffer.from("83", "hex"));
port._client.receive(Buffer.from("04", "hex"));
port._client.receive(Buffer.from("41", "hex"));
port._client.receive(Buffer.from("36", "hex"));
});
});
});
it("Special data package, should return a valid Modbus RTU message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal(LONG_MSG);
done();
});
port.open(function() {
port.write(Buffer.from("010300000040443A", "hex"));
setTimeout(function() {
for (let i = 0; i < LONG_MSG.length; i += 2) {
port._client.receive(Buffer.from(LONG_MSG.slice(i, i + 2), "hex"));
}
});
});
});
it("Illegal start chars, should synchronize to valid Modbus RTU message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("20", "hex")); // illegal char
port._client.receive(Buffer.from("54", "hex")); // illegal char
port._client.receive(Buffer.from("54", "hex")); // illegal char
port._client.receive(Buffer.from("ff", "hex")); // illegal char
port._client.receive(Buffer.from("11", "hex"));
port._client.receive(Buffer.from("03", "hex"));
port._client.receive(Buffer.from("06", "hex"));
port._client.receive(Buffer.from("ae", "hex"));
port._client.receive(Buffer.from("41", "hex"));
port._client.receive(Buffer.from("56", "hex"));
port._client.receive(Buffer.from("52", "hex"));
port._client.receive(Buffer.from("43", "hex"));
port._client.receive(Buffer.from("40", "hex"));
port._client.receive(Buffer.from("49", "hex"));
port._client.receive(Buffer.from("ad", "hex"));
});
});
});
it("Illegal end chars, should return a valid Modbus RTU message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("11", "hex"));
port._client.receive(Buffer.from("03", "hex"));
port._client.receive(Buffer.from("06", "hex"));
port._client.receive(Buffer.from("ae", "hex"));
port._client.receive(Buffer.from("41", "hex"));
port._client.receive(Buffer.from("56", "hex"));
port._client.receive(Buffer.from("52", "hex"));
port._client.receive(Buffer.from("43", "hex"));
port._client.receive(Buffer.from("40", "hex"));
port._client.receive(Buffer.from("49", "hex"));
port._client.receive(Buffer.from("ad", "hex"));
port._client.receive(Buffer.from("20", "hex")); // illegal char
port._client.receive(Buffer.from("54", "hex")); // illegal char
port._client.receive(Buffer.from("54", "hex")); // illegal char
port._client.receive(Buffer.from("ff", "hex")); // illegal char
});
});
});
it("should return a valid Modbus RTU message on illegal chars", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("11", "hex"));
port._client.receive(Buffer.from("03", "hex"));
port._client.receive(Buffer.from("06", "hex"));
port._client.receive(Buffer.from("ae", "hex"));
port._client.receive(Buffer.from("41", "hex"));
port._client.receive(Buffer.from("56", "hex"));
port._client.receive(Buffer.from("52", "hex"));
port._client.receive(Buffer.from("43", "hex"));
port._client.receive(Buffer.from("40", "hex"));
port._client.receive(Buffer.from("49", "hex"));
port._client.receive(Buffer.from("ad", "hex"));
});
});
});
});
describe("#write", function() {
it("should write a valid RTU message to the port", function() {
port.write(Buffer.from("1103006B00037687", "hex"));
expect(port._client._data.toString("hex")).to.equal("1103006b00037687");
});
});
});