modbus-serial
Version:
A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.
240 lines (194 loc) • 8.09 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 (no serverID)", function() {
let serverTCP; // eslint-disable-line no-unused-vars
before(function() {
const vector = {
getInputRegister: function(addr) {
return addr;
},
getHoldingRegister: function(addr) {
if (addr === 62)
throw new Error();
console.log("\tHolding register: ", addr);
return addr + 8000;
},
getCoil: function(addr) {
console.log("\tHolding register: ", addr);
return (addr % 2) === 0;
},
setRegister: function(addr, value) {
console.log("\tset register", addr, value);
return;
},
setCoil: function(addr, value) {
console.log("\tset coil", addr, value);
return;
}
};
serverTCP = new TcpServer(vector, { host: "0.0.0.0", port: 8512, debug: true });
});
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: 8512 }, 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");
client.end();
done();
});
});
// TODO: FC1 - FCX tests
});
describe("modbus exception handler", function() {
it("should receive a valid unhandled function Modbus TCP message", function(done) {
const client = net.connect({ host: "0.0.0.0", port: 8512 }, 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");
client.end();
done();
});
});
it("should receive a valid slave failure Modbus TCP message", function(done) {
const client = net.connect({ host: "0.0.0.0", port: 8512 }, 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");
client.end();
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: 8512 }, function() {
client.destroy();
serverTCP.emit("socketError");
});
serverTCP.on("socketError", function() {
// Error handled correctly
client.end();
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: 8512 }, 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");
client.end();
done();
});
});
it("should handle a large request without crash successfully (FC3)", function(done) {
const client = net.connect({ host: "0.0.0.0", port: 8512 }, 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");
client.end();
done();
});
});
it("should handle a large request without crash successfully (FC4)", function(done) {
const client = net.connect({ host: "0.0.0.0", port: 8512 }, 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");
client.end();
done();
});
});
// TODO: exceptions
});
});
describe("Modbus TCP Server (serverID = requestID)", function() {
let serverTCP; // eslint-disable-line no-unused-vars
before(function() {
const vector = {
setCoil: function(addr, value) {
console.log("\tset coil", addr, value);
return;
}
};
serverTCP = new TcpServer(vector, { host: "0.0.0.0", port: 8512, debug: true, unitID: 0x04 });
});
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: 8512 }, function() {
// FC05 - force single coil, to on 0xff00
client.write(Buffer.from("00010000000604050005ff00", "hex"));
});
client.once("data", function(data) {
// FC05 - valid responce
expect(data.toString("hex")).to.equal("00010000000604050005ff00");
client.end();
done();
});
});
});
});
describe("Modbus TCP Server (serverID != requestID)", function() {
let serverTCP; // eslint-disable-line no-unused-vars
before(function() {
const vector = {
setCoil: function(addr, value) {
console.log("\tset coil", addr, value);
return;
}
};
serverTCP = new TcpServer(vector, { host: "0.0.0.0", port: 8512, debug: true, unitID: 0x04 });
});
after(function() {
serverTCP.close();
});
describe("function code handler", function() {
it("should receive a no Modbus TCP message for wrong unitID", function(done) {
let timeout;
this.timeout(1000 + 100);
const client = net.connect({ host: "0.0.0.0", port: 8512 }, function() {
// FC05 - force single coil, to on 0xff00
client.write(Buffer.from("00010000000603050005ff00", "hex"));
timeout = setTimeout(done, 1000);
});
client.once("data", function(data) {
clearTimeout(timeout);
// FC05 - we expect no data for wrong unitID
expect(data.toString("hex")).to.equal("NO DATA");
client.end();
done();
});
});
});
});