Maya builtin socket server

import maya.cmds as cmds

# Launch Server 
cmds.commandPort(n="localhost:1234", sourceType='python', close=False)

# Stop Server 
cmds.commandPort(n="localhost:1234", sourceType='python', close=True)

# /!\ sourceType is very important !
# if you doesn't specify sourceType and you send python command you will get :  Cannot find procedure "import" or somethng like this
# mel by default ???