getGroupId(): Integer;
The getGroupId method of the JadeMultiWorkerTcpTransport class returns the unique number assigned to each transport group when it is created by the first worker to call the beginListening method with a new full name.
Each time a transport group is created in a node, it is given a different group identifier even if it has previously used a full name.
The getGroupId method returns zero (0) until a call to the beginListening method is successful.