IoCommandStruct can be used to send IO commands to groups
 
    The struct created by this function can be used to set pins on
    an IO board. NaN and Inf values are ignored. Setting values
    to pins that are not configured to be output pins will be ignored
    by the hardware.
 
    Example
        io = IoCommandStruct();
        io.a1 = 1;
        io.b3 = 0.3;
        group.send('io', io);