Error: This socket has been ended by the other party

[node-modbus]

Error: This socket has been ended by the other party

[dresende]

Post your tcp master code to see if I can spot anything.

[IlhanSeven]

function connectToSlave() {
	modbus.tcp.connect(modbusPort, modbusIp, { debug: null }, (err, connection) => {
    
		if(err) {
			//throw err;
			console.log("Will try to reconnect in 3 seconds");
			setTimeout(connectToSlave, 3000);
		} else {
			console.log("Connected to the slave");
			setInterval(function(){
				
				var valuesArray = new Array();
				for(var i = 42001; i <= 42017; i++) {
					
					valuesArray.push(gatewayMap[i]);
				}
				
				connection.writeMultipleRegisters({ address: 42001, values: valuesArray}, (err, info) => {
					
					if(err) throw err;
				});
				
				connection.readInputRegisters({ address: 42101, quantity: 7}, (err, res) => {
					
					if(err) throw err;
					for(var i = 0; i<7; i++) {
						gatewayMap[i+42101] = res.response.data[i];
					}
					io.emit('updateInputRegisters', { values: gatewayMap });
				})
				
				connection.readInputRegisters({ address: 49001, quantity: 6}, (err, res) => {
					
					if(err) throw err;
					for(var i = 0; i<6; i++) {
						gatewayMap[i+49001] = res.response.data[i];
					}
					io.emit('updateInputRegisters', { values: gatewayMap });
				})
				
			}, 1000);
		}
	});
}

[dresende]

I was not thinking properly, missing my coffee. Your initial error is not related to docker, it's telling you your other end closed the socket. Perhaps because you have a setInterval the connection is ended in the meanwhile and you keep requesting information but the socket stream is closed.

[dresende]

I'm also not sure if it's not a problem with io.

[IlhanSeven]

you might be right about setInterval. Do you have any suggestions or alternatives to it?

[dresende]

I would store the interval id. Something like this:

let timer = setInterval(...);

And after that I would listen for the error event in the connection object and would stop the interval and reconnect.

connection.on("error", (err) => {
    clearInterval(timer);
    console.log(err);

    // reconnect();
});

[dresende]

Reopen if it didn't solve and you have any more information.