lua - Concatenation of userdata in Wireshark's dissector -


i'm trying concatenate userdata type (tvb) in custom wireshark's dissector, created in lua. 

globalbuffer = globalbuffer .. buffer

however, results in error, "attempt concatenate upvalue 'globalbuffer'". changed above line this:

globalbuffer = globalbuffer.value .. buffer

now i'm getting this: "no such 'value' function/method/field object type 'tvb'

how concatenate 2 buffers in lua dissector, previous frame , current?


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