node-modbus-serial: Server is not processing parallel requests

I just started the example server

I created a client that sends more three readHoldingRegisters requests.

However, on the server, some requests are not being received. This is not an issue with the client as I have tested it with a simulator and it works fine.

I’ve just put multiple requests in the example client logger.

function run() {

    // read the 4 registers starting at address 5
    client.readHoldingRegisters(5, 4)
        .then(function(d) {
            console.log("Receive:", d.data); })
        .then(function() {
        	setTimeout(run, 1000); })
        .catch(function(e) {
            checkError(e);
            console.log(e.message); });
            
     client.readHoldingRegisters(10, 4)
        .then(function(d) {
            console.log("Receive:", d.data); })
        .catch(function(e) {
            checkError(e);
            console.log(e.message); });
     client.readHoldingRegisters(15, 4)
        .then(function(d) {
            console.log("Receive:", d.data); })
        .catch(function(e) {
            checkError(e);
            console.log(e.message); });
}

On the server, the getHoldingRegister does not get executed for all of the addresses.