Cls < Command
Nsqrb::Command Fin < Command
Nsqrb::Command Nop < Command
Nsqrb::Command Pub < Command
Nsqrb::Command Rdy < Command
Nsqrb::Command Req < Command
Nsqrb::Command Sub < Command
Nsqrb::Command Touch < Command
Nsqrb::Command
Error < Frame
Nsqrb::Frame