modbus-serial
Version:
A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.
166 lines (142 loc) • 6.12 kB
JavaScript
;
/* eslint-disable no-undef, no-console */
const expect = require("chai").expect;
const net = require("net");
const TcpServer = require("./../../servers/servertcp");
describe("Modbus TCP Server Promise", function() {
let serverTCP; // eslint-disable-line no-unused-vars
before(function() {
const vector = {
getInputRegister: function(addr) {
return new Promise(function(resolve) {
setTimeout(function() {
resolve(addr);
}, 50);
});
},
getHoldingRegister: function(addr) {
return new Promise(function(resolve, reject) {
setTimeout(function() {
if (addr === 62)
return reject(new Error());
resolve(addr + 8000);
}, 50);
});
},
getCoil: function(addr) {
return new Promise(function(resolve) {
setTimeout(function() {
resolve((addr % 2) === 0);
}, 50);
});
},
setRegister: function(addr, value) {
return new Promise(function(resolve) {
setTimeout(function() {
console.log("\tset register", addr, value);
resolve();
}, 50);
});
},
setCoil: function(addr, value) {
return new Promise(function(resolve) {
setTimeout(function() {
console.log("\tset coil", addr, value);
resolve();
}, 50);
});
}
};
serverTCP = new TcpServer(vector, { host: "0.0.0.0", port: 8514, 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: 8514 }, 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: 8514 }, 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: 8514 }, 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: 8514 }, 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: 8514 }, 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: 8514 }, 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: 8514 }, 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();
});
});
});
});