How to boot headfull (vs headless) android emulator via SSH

Via remote viewer VNC I can boot android emulator on remote machine

emulator -avd emu1 

but via SSH on remote machine I get error

emulator: INFO: QtLogger.cpp:68: Warning: could not connect to display  ((null):0, (null))


emulator: INFO: QtLogger.cpp:68: Info: Could not load the Qt platform plugin "xcb" in "/opt/androidtest/android-sdk/emulator/lib64/qt/plugins" even though it was found. ((null):0, (null))


Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.
 ((null):0, (null))
emulator: INFO: QtLogger.cpp:68: Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.
 ((null):0, (null))

but If I boot emulator headlessly via SSH, the emulator boots

emulator -avd emu1 -no-window

from How to boot headfull (vs headless) android emulator via SSH