ASCII number to Char/String

Configuration
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1

Hi there, I am reading values through MQTT from device that sends display values as series of ASCII codes, i.e 52 32 52.

Is there an easy way to convert this back to chars?

2

There’s discussion of a template here:

Don’t understand a word of it myself. :roll_eyes:

3

I solved it by brutal, but effective thing :slight_smile:

      {% set ascii = " !'#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~" %}
      {{ ascii[value_json.CH1 - 32] + ascii[value_json.CH2 - 32] + ascii[value_json.CH3 - 32] }}
4

Method that doesn’t require hardcoding the ASCII table nor splitting into explicit separate characters.

{% set a = "72 101 108 108 111 32 119 111 114 108 100 33" %}
{% set b = a.split()|map('int')|list %}
{{ ("%c"*b|length)|format(*b) }}

Line 1 defines the input string, a series of space-separated numbers as you presented in the original post.
Line 2 breaks these up and turns them into a list of integers.
Line 3 then prints them out as a set of characters. That line expands to:

{{ "%c%c%c%c%c%c%c%c%c%c%c%c"|format(72,101,108,108,111,32,119,111,114,108,100,33) }}