[dsmr] Add internal 'telegram' text_sensor to support bridging (#6841)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/dsmr/dsmr.cpp

@@ -256,6 +256,7 @@ bool Dsmr::parse_telegram() {
   MyData data;
   ESP_LOGV(TAG, "Trying to parse telegram");
   this->stop_requesting_data_();
+
   ::dsmr::ParseResult<void> res =
       ::dsmr::P1Parser::parse(&data, this->telegram_, this->bytes_read_, false,
                               this->crc_check_);  // Parse telegram according to data definition. Ignore unknown values.
@@ -267,6 +268,11 @@ bool Dsmr::parse_telegram() {
   } else {
     this->status_clear_warning();
     this->publish_sensors(data);
+
+    // publish the telegram, after publishing the sensors so it can also trigger action based on latest values
+    if (this->s_telegram_ != nullptr) {
+      this->s_telegram_->publish_state(std::string(this->telegram_, this->bytes_read_));
+    }
     return true;
   }
 }

esphome/components/dsmr/dsmr.h

@@ -85,6 +85,9 @@ class Dsmr : public Component, public uart::UARTDevice {
   void set_##s(text_sensor::TextSensor *sensor) { s_##s##_ = sensor; }
   DSMR_TEXT_SENSOR_LIST(DSMR_SET_TEXT_SENSOR, )
 
+  // handled outside dsmr
+  void set_telegram(text_sensor::TextSensor *sensor) { s_telegram_ = sensor; }
+
  protected:
   void receive_telegram_();
   void receive_encrypted_telegram_();
@@ -124,6 +127,9 @@ class Dsmr : public Component, public uart::UARTDevice {
   bool header_found_{false};
   bool footer_found_{false};
 
+  // handled outside dsmr
+  text_sensor::TextSensor *s_telegram_{nullptr};
+
 // Sensor member pointers
 #define DSMR_DECLARE_SENSOR(s) sensor::Sensor *s_##s##_{nullptr};
   DSMR_SENSOR_LIST(DSMR_DECLARE_SENSOR, )

esphome/components/dsmr/text_sensor.py

@@ -1,7 +1,7 @@
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.components import text_sensor
-
+from esphome.const import CONF_INTERNAL
 from . import Dsmr, CONF_DSMR_ID
 
 AUTO_LOAD = ["dsmr"]
@@ -22,6 +22,9 @@ CONFIG_SCHEMA = cv.Schema(
         cv.Optional("water_equipment_id"): text_sensor.text_sensor_schema(),
         cv.Optional("sub_equipment_id"): text_sensor.text_sensor_schema(),
         cv.Optional("gas_delivered_text"): text_sensor.text_sensor_schema(),
+        cv.Optional("telegram"): text_sensor.text_sensor_schema().extend(
+            {cv.Optional(CONF_INTERNAL, default=True): cv.boolean}
+        ),
     }
 ).extend(cv.COMPONENT_SCHEMA)
 
@@ -37,6 +40,8 @@ async def to_code(config):
         if id and id.type == text_sensor.TextSensor:
             var = await text_sensor.new_text_sensor(conf)
             cg.add(getattr(hub, f"set_{key}")(var))
+            if key != "telegram":
+                # telegram is not handled by dsmr
                 text_sensors.append(f"F({key})")
 
     if text_sensors: