How to "clone" a weather entity into a template sensor, with less datafields?

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Okay, things are getting weird here. I was working on the template sensor solution, and wanted to verify the max size/length of the esphome text sensor before. I couldnt find an “official” documentation entry for the “255 max” anymore. What did strike me though: when looking at the log ouput of the esphome node, the text sensor content was indeed cut off, but way past the supposed 255 characters:

logoutput
logoutput968×159 8.32 KB

(I’m now wondering if the cutoff in the logs is not because of the sensor size but because of the max length of a log entry…)

Based on the original code, this is the output I could extract from the sensor so far, 10 items from the list:

20220503_100338_resized
20220503_100338_resized1597×1512 99.9 KB

Just for kicks I increased the document size within arduinoJson from 2048 to 4048, and after compiling and flashing I now get twice the number of bars.

So it looks as if just increasing the document size works for my usecase, and I can just use the existing text sensor to pull data in. But I still want to find the ACTUAL size/length limit of the HA text sensor for future usecases…

For the sake of completeness:

The sensor to pull in the forecast data in esphome (the bottom one):

text_sensor:
  - platform: homeassistant
    id: outside_weather
    entity_id: weather.home
    internal: true
  - platform: homeassistant
    id: owm_forecast
    entity_id: weather.openweathermap
    internal: true
    attribute: forecast

The code to extract and deserialise the JSON coming from the text sensor (where I now switched 2048 to 4048):

      - id: page2
        lambda: |-
          it.printf(0, 0, id(fontsmall), "chance of rain 24h");
          it.line(5, 25, 291, 25);
          if (id(owm_forecast).has_state())
          {
          DynamicJsonDocument doc(2048);
          deserializeJson(doc, (id(owm_forecast).state.c_str()));
          JsonArray root = doc.as<JsonArray>();
          int linestart = 5;
          for (int i=0; i <= 23; ++i)
          {
          JsonObject root_0 = root[i];
          float root_0_precipitation_probability = root_0["clouds"];
          int heighthelper = 1 + (int)root_0_precipitation_probability;
          int offsethelper = 125 - heighthelper;
          it.filled_rectangle(linestart, offsethelper, 10, heighthelper);
          linestart += 12;
          }
          
          }

(fyi: I’m using the “clouds” datafield at the moment as there are always values, while chance of rain is mostly zero these days)

Here are 2 examples where I found the 255char limit mentioned:

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