Client 
Trigger Server Callback 
st.callback 
The response is handled in a separate coroutine.
lua
st.callback(name, delay, cb, ...)- name: string
- delay: numberorfalse- Amount of time until this callback can be triggered again
 
- cb: function
- ...: any
st.callback.await 
The current coroutine is yielded until a response is received.
lua
st.callback.await(name, delay, ...)- name: string
- delay: numberorfalse- Amount of time until this callback can be triggered again
 
- ...: any
Register Client Callback 
st.callback.register 
Register an event handler for responding to server requests.
lua
st.callback.register(name, cb)- name: string
- cb: function