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modbus-serial

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A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.

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"use strict"; /* eslint-disable no-undef, no-console */ const expect = require("chai").expect; const net = require("net"); const TcpServer = require("./../../servers/servertcp"); describe("Modbus TCP Server Callback", function() { let serverTCP; // eslint-disable-line no-unused-vars before(function() { const vector = { getInputRegister: function(addr, unit, callback) { setTimeout(function() { callback(null, addr); }, 50); }, getHoldingRegister: function(addr, unit, callback) { setTimeout(function() { if (addr === 0x003E) { callback(new Error()); return; } callback(null, addr + 8000); }, 50); }, getCoil: function(addr, unit, callback) { setTimeout(function() { callback(null, (addr % 2) === 0); }, 50); }, setRegister: function(addr, value, unit, callback) { setTimeout(function() { console.log("set register", addr, value); callback(null); }, 50); }, setCoil: function(addr, value, unit, callback) { setTimeout(function() {console.log("\tset coil", addr, value); callback(null); }, 50); } }; serverTCP = new TcpServer(vector, { host: "0.0.0.0", port: 8513, debug: true, unitID: 1 }); }); after(function() { serverTCP.close(); }); describe("function code handler", function() { it("should receive a valid Modbus TCP message", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // FC05 - force single coil, to on 0xff00 client.write(Buffer.from("00010000000601050005ff00", "hex")); }); client.once("data", function(data) { // FC05 - valid responce expect(data.toString("hex")).to.equal("00010000000601050005ff00"); done(); }); }); // TODO: FC1 - FCX tests }); describe("modbus exception handler", function() { it("should receive a valid Modbus TCP message", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // FC07 - unhandled function client.write(Buffer.from("000100000006010700000000", "hex")); }); client.once("data", function(data) { // A valid error message, code 0x01 - Illegal fanction expect(data.toString("hex")).to.equal("000100000003018701"); done(); }); }); it("should receive a valid slave failure Modbus TCP message", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // FC03 to error triggering address client.write(Buffer.from("0001000000060103003E0001", "hex")); }); client.once("data", function(data) { // A valid error message, code 0x04 - Slave failure expect(data.toString("hex")).to.equal("000100000003018304"); done(); }); }); // TODO: exceptions }); describe("socket connection error", function() { it("should receive an error event on socket closed by client", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { client.destroy(); serverTCP.emit("socketError"); }); serverTCP.on("socketError", function() { // Error handled correctly done(); }); }); // TODO: exceptions }); describe("large client request", function() { it("should handle a large request without crash successfully (FC1)", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // request 65535 registers at once client.write(Buffer.from("0001000000060101003EFFFF", "hex")); }); client.once("data", function(data) { // A valid error message, code 0x04 - Slave failure expect(data.toString("hex")).to.equal("000100000003018104"); done(); }); }); it("should handle a large request without crash successfully (FC3)", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // request 65535 registers at once client.write(Buffer.from("0001000000060103003EFFFF", "hex")); }); client.once("data", function(data) { // A valid error message, code 0x04 - Slave failure expect(data.toString("hex")).to.equal("000100000003018304"); done(); }); }); it("should handle a large request without crash successfully (FC4)", function(done) { const client = net.connect({ host: "0.0.0.0", port: 8513 }, function() { // request 65535 registers at once client.write(Buffer.from("0001000000060104003EFFFF", "hex")); }); client.once("data", function(data) { // A valid error message, code 0x04 - Slave failure expect(data.toString("hex")).to.equal("000100000003018404"); done(); }); }); }); });