Controlling Esp unit from cloud using websockets?

Ok I think I know what the issue is basically the write method has an issue with passing it functions. Feel free to look at the screenshot or logs below.

When I pass LoopbackA.write("Hello"); , Hello is transmitted across ws.

When I pass LoopbackB.write(digitalWrite(D5,1)); The LED is turned on, but the error below is given.

When I pass LoopbackB.write(digitalWrite(D5,0)); The LED is turned off, but the error below is given.

When I pass console.log("test"); test prints out to the ESPRUINO IDE but is not transmitted and the same error is given.

I also tried directly passing console.log("test"); into LoopbackB but got the same error.

Check out the attached screenshot, it's much easier to see.
Console from ESPRUINO WEB IDE

>LoopbackA.write("Hello");
=undefined
>LoopbackA.write(digitalWrite(D5,1));
Uncaught TypeError: Expecting a number or something iterable, got undefined
 at line 1 col 35
LoopbackA.write(digitalWrite(D5,1));
                                  ^
> 

CONSOLE FROM MY WEB APP

>>Server:Ready!
>>Hello

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