(classic)liu-xiao-guo@localhost:~/apps/mosquitto$ snapcraft 
"grade" property not specified: defaulting to "stable"
DEPRECATED: Found a "/" in the name of the 'mqtt-paho/python3' part
DEPRECATED: The 'python3' plugin's functionality has been replaced by the 'python' plugin, and it will soon be removed.
'ascii' codec can't encode character '\u29f8' in position 49: ordinal not in range(128)