Multiple SerialPorts delay (C#)

Hi,

I'm developing an application in Unity that will communicate via Bluetooth (using the SerialPort C# class) with some devices that send me data continuosly. I print this data on the screen and Log, to ensure communication is stablished and data is received at a steady rate. When using only 1 device, everything seems to be running fine, data is shown correctly on the screen.

But when I use 2 devices, data input has a delay of some seconds for one (sometimes both) of the devices. I'm almost 100% sure that the problem comes from the line where I read from the devices:

 string result = serialPort.ReadLine();

My guess is that when this code is called for the first device, the second has to wait for the first to end, which causes the delay.

Does anyone know a solution or workaround to this problem? (for example: use another C# classes, another Serialport connection paramteters, use another SerialPort read method to read the input from the devices, use some kind of threading in Unity ,...).

I'm using Untiy and Windows 7 x64.

Thanks in advance