Trying to control playback folder with a tag's NDEF text field

README.md

@@ -0,0 +1,6 @@
+# Fabula
+
+## NFC Tag format
+
+I used Mifare ultralight tags.
+A valid tag should contain a single text field containing the name of the directory to play (a number between 01 and 99).

esphome/fabula.yaml

@@ -35,10 +35,24 @@ pn532_i2c:
   update_interval: 1s
   on_tag:
     then:
-      - logger.log: "NFC Tag found"
+      # - logger.log:
+      #     format: "NFC Tag found: %s"
+      #     args: [ 'tag.get_ndef_message()->get_records()[0]->get_payload().c_str()' ]
       - dfplayer.play_folder:
-          folder: !lambda 'return 1;'
           loop: True
+          # Crashes somewhere here in the lambda
+          folder: !lambda |-
+            if (!tag.has_ndef_message()) {
+              return 0; // Plays "No tag found" audio
+            }
+            auto message = tag.get_ndef_message();
+            auto records = message->get_records();
+            for (auto &record : records) {
+              std::string payload = record->get_payload();
+              ESP_LOGD("Fabula", "NFC NDEF record type %s - value %s - int value %d", record->get_type().c_str(), record->get_payload().c_str(), stoi(payload));
+              return stoi(payload);
+            }
+            return 0;
   on_tag_removed: 
     then:
       - logger.log: "NFC Tag removed"