DynamicJsonDocument allocation size in line object

[lhag87]

I wanted to add small atmospheric pressure graph with 25 points line object but it fail with a maximum of 8 points ( on a GS-t3e plate rev 2.4 0.7.0-rc13 standard build).

The size of the DynamicJsonDocument in hasp_attribute.cpp/my_line_set_points() estimated based on the payload length appears to be too short. It fail with:
2026-02-28T19:23:37.962273+01:00 t3e ATTR [77812/91192 14][48132/48888 2]JSON parsing failed: 4 2026-02-28T19:23:37.972899+01:00 t3e ATTR [77812/91592 15][48132/48888 2]Unknown error (-9)

Using the ArduinoJson assistant, a size of nb_points x 48 seems correct for an esp32 and nb_points x 96 for linux_sdl, which corresponds to nb_points x 3 x JSON_ARRAY_SIZE(1)
I was able with this to add a 196 points line object ~8k JsonDocument size.

Can i propose a patch file or a pull request ?

[fvanroie]

Yes sure, I haven't really needed or tested lines with that many points.

[fvanroie]

Added in PR #1004