After the Onos connects to the p4 switch, there is a problem that the device is not online. This is the configuration file I wrote to the Onos

[lq1]

hi,
After my p4 switch is started, read "/etc/stat/pipeline_ Cfg. pb. txt ', but the pipeline in my switch_ Cfg.pb.txt is empty, pipeline_ What should be written in cfg.pb.txt?