add TriggerDiscoveryButton component with discovery functionality

components/truma_inetbox/TriggerDiscoveryButton.cpp

@@ -0,0 +1,19 @@
+#include "TriggerDiscoveryButton.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace truma_inetbox {
+
+static const char *const TAG = "truma_inetbox.TriggerDiscoveryButton";
+
+void TriggerDiscoveryButton::press_action() {
+  ESP_LOGI(TAG, "Discovery button pressed");
+  if (this->parent_ != nullptr) {
+    this->parent_->trigger_discovery();
+  } else {
+    ESP_LOGW(TAG, "No parent TrumaiNetBoxApp found");
+  }
+}
+
+}  // namespace truma_inetbox
+}  // namespace esphome

components/truma_inetbox/TriggerDiscoveryButton.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/button/button.h"
+#include "TrumaiNetBoxApp.h"
+
+namespace esphome {
+namespace truma_inetbox {
+
+class TriggerDiscoveryButton : public button::Button, public Component {
+ public:
+  void set_parent(TrumaiNetBoxApp *parent) { this->parent_ = parent; }
+
+ protected:
+  void press_action() override;
+
+  TrumaiNetBoxApp *parent_;
+};
+
+}  // namespace truma_inetbox
+}  // namespace esphome

components/truma_inetbox/TrumaiNetBoxApp.cpp

@@ -474,4 +474,28 @@ bool TrumaiNetBoxApp::master_scan_b2(uint8_t nad, uint8_t ident_start, uint8_t i
   return true;
 }
 
+void TrumaiNetBoxApp::trigger_discovery() {
+  if (!this->master_mode_) {
+    ESP_LOGW(TAG, "Discovery can only be triggered in master mode");
+    return;
+  }
+  
+  // Start targeted device discovery like CP Plus does
+  // Query known Truma device identifiers instead of full scan
+  
+  // Query identifier 0x23 - typical for Truma heaters
+  std::vector<uint8_t> heater_query = {0xB2, 0x23, 0x17, 0x46, 0x01, 0x03};
+  this->master_send_diag_single(0x7F, heater_query);
+  
+  // Query identifier 0x00 - LIN Product Identification 
+  std::vector<uint8_t> prod_id_query = {0xB2, 0x00, 0x17, 0x46, 0x00, 0x1F};
+  this->master_send_diag_single(0x7F, prod_id_query);
+  
+  // Query identifier 0x00 with different device signatures
+  std::vector<uint8_t> heater_prod_query = {0xB2, 0x00, 0x17, 0x46, 0x40, 0x03}; // Heater signature
+  this->master_send_diag_single(0x7F, heater_prod_query);
+  
+  ESP_LOGI(TAG, "Manual discovery triggered - sending CP Plus style discovery commands");
+}
+
 } }

components/truma_inetbox/TrumaiNetBoxApp.h

@@ -31,6 +31,7 @@ class TrumaiNetBoxApp : public LinBusProtocol {
     // Master scanner API
   bool master_send_diag_single(uint8_t nad, const std::vector<uint8_t> &payload);
   bool master_scan_b2(uint8_t nad, uint8_t ident_start, uint8_t ident_end );
+  void trigger_discovery();
 
   TRUMA_DEVICE get_heater_device() const { return this->heater_device_; }
   TRUMA_DEVICE get_aircon_device() const { return this->aircon_device_; }

components/truma_inetbox/button.py

@@ -0,0 +1,27 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import button
+from esphome.const import CONF_ID
+
+from . import TrumaINetBoxApp, truma_inetbox_ns, CONF_TRUMA_INETBOX_ID
+
+DEPENDENCIES = ["truma_inetbox"]
+
+TriggerDiscoveryButton = truma_inetbox_ns.class_(
+    "TriggerDiscoveryButton", button.Button, cg.Component
+)
+
+CONFIG_SCHEMA = {
+    cv.GenerateID(): cv.declare_id(TriggerDiscoveryButton),
+    cv.GenerateID(CONF_TRUMA_INETBOX_ID): cv.use_id(TrumaINetBoxApp),
+}
+
+CONFIG_SCHEMA = button.button_schema(TriggerDiscoveryButton).extend(CONFIG_SCHEMA)
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await button.register_button(var, config)
+    await cg.register_component(var, config)
+    
+    parent = await cg.get_variable(config[CONF_TRUMA_INETBOX_ID])
+    cg.add(var.set_parent(parent))