Restoring text_sensor after reboot

ESPHome
1

I need to maintain a text_sensor value over reboot.

I have a global: (the initial value is arbitrary)

  - id: last_feed_time_text
    type: char[17]
    restore_value: yes
    initial_value: "{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q'}"

…and want to update it using this:

      - text_sensor.template.publish: # Publish feed time to HA
          id: last_feed
          state: !lambda |-
              char str[17];
              time_t currTime = id(on_board_time).now().timestamp;
              strftime(str, sizeof(str), "%Y-%m-%d %H:%M", localtime(&currTime));
              return  { str };
      - globals.set:                                 # Store calculated hopper weight after feed
          id: last_feed_time_text
          value: !lambda 'return id(last_feed);'

The text_sensor.template.publish: works fine.

When I add the globals.set, it passes validation but fails to compile, delivering errors like below.

src/esphome/core/helpers.h:248:5: error: function returning an array
   T value(X... x) {
     ^
src/esphome/core/helpers.h:263:5: error: function returning an array
   T value_or(X... x, T default_value) {
     ^
src/esphome/core/helpers.h:278:26: error: function returning an array
   std::function<T(X...)> f_;

Is what I’m trying possible? If yes, where am I going wrong?

3

Solution:

In the global, type: needs to set as std::string

 - id: last_feed_time_text
    type: std::string
    restore_value: yes

In the global.set, id(last_feed).state needs to be used.

       - globals.set:                                 # Store calculated hopper weight after feed
           id: last_feed_time_text
           value: !lambda 'return id(last_feed).state;'