dataHeader: number indicating who "designed" the communication message. Always use the same header (because only you will know the meaning of the message) and stick to it. The best is to use the serial number of your V-REP copy (check the "Help" menu, in the "About" item for the serial number). Otherwise, you risk collision with other developer's messages which might use the same header as yours.
dataName: name indicating the type of message. A tube will only be able to connect if its two sides have the same dataHeader and dataName
readBufferSize: the number of data packets that can be stored in the input buffer of this side of the tube
notUsedButKeepFalse: not used. Keep to false.