Thank you, David. That's what I was looking for

what about the duet, is there any limit for maximum data it can send through a JSON response? like for M20 and M408 commands

Yea I saw that on the wiki, I was about to edit it

What is the maximum size of the buffer? I'm trying to build a new GUI interface. On the deserialization part, I can't finalize on the size of the buffer.

Hi David,

Thank you for your fast response. This information is missing on the duet Gcode and RepRap Gcode wiki. How much file name can be included in a JSON response can have at the present moment. Is there any limit on the size of JSON responses duet passes? Even on M408 S0 R and M408 S1 in case of the maximum messages that it can include?

Hi All,

A typical JSON response for M20 is as follows:

{"dir":"0:/gcodes","first":0,"files":["ANGLE BRACKET (46.30).gcode","treefrog_45_SST1.gcode","treefrog_45_SST2.gcode","treefrog_45_SST3.gcode","treefrog_45_SST4.gcode","30mmCube_POT1.gcode"],"next":0,"err":0}

I Can't find any information regarding the following pairs "first":0,"next":0,"err":0 . The error I guess will the error in the sd, but what all possible values do that have or just 0 and 1. It would be nice if someone can explain it. Thank you all in advance.