Vaadin - CSRF Token

Hi there,

can anyone explain me all positions which are in the following token?

{"csrfToken":"5697050d-27d0-4d66-8c13-28c62bd7617e","rpc":[["30","v","v",["text",["s","dddssdsds"] ]],["30","v","v",["c",["i",9] ]],["32","com.vaadin.shared.ui.button.ButtonServerRpc","click",[{"altKey":false,"button":"LEFT","clientX":137,"clientY":624,"ctrlKey":false,"metaKey":false,"relativeX":100,"relativeY":26,"shiftKey":false,"type":1}] ]],"syncId":47,"clientId":22} For example, what does

"rpc":[["30","v","v",["text",["s","dddssdsds"] ] mean?

Thanks in advance!

Best regards,
Nazar