add slave response frame

udp_lin_receiver: add option to suppress repeated identical messages

components/truma_inetbox/LinBusListener_esp32_arduino.cpp

@@ -92,6 +92,8 @@ bool LinBusListener::write_lin_master_frame_(uint8_t pid, const uint8_t *data, u
   auto uartComp = static_cast<ESPHOME_UART *>(this->parent_);
   auto uart_num = uartComp->get_hw_serial_number();
   auto hw_serial = uartComp->get_hw_serial();
+  
+  // Send master frame (break + sync + pid + data + crc)
   uart_send_break((uint8_t) uart_num);
   hw_serial->write(0x55);
   uint8_t pid_with_parity = (pid & 0x3F) | (addr_parity(pid) << 6);
@@ -100,6 +102,23 @@ bool LinBusListener::write_lin_master_frame_(uint8_t pid, const uint8_t *data, u
   if (len > 0) hw_serial->write((uint8_t*)data, len);
   hw_serial->write(crc);
   hw_serial->flush();
+  
+  // For diagnostic frames (0x3C), automatically schedule slave response (0x7D)
+  if (pid == 0x3C) {
+    // Small delay to allow slave processing time
+    delayMicroseconds(5000); // 5ms delay
+    
+    // Send response slot header (break + sync + 0x7D with parity)
+    uart_send_break((uint8_t) uart_num);
+    hw_serial->write(0x55);
+    uint8_t response_pid_with_parity = (0x7D & 0x3F) | (addr_parity(0x7D) << 6);
+    hw_serial->write(response_pid_with_parity);
+    hw_serial->flush();
+    
+    // Note: We don't send data/CRC for response slot - slave will provide that
+    ESP_LOGD(TAG, "Scheduled 0x7D response slot after 0x3C diagnostic frame");
+  }
+  
   return true;
 }
 

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

@@ -4,6 +4,14 @@
 #include "esphome/core/helpers.h"
 #include "helpers.h"
 
+#ifdef USE_ESP32
+#include <sstream>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <unistd.h>
+#endif
+
 namespace esphome {
 namespace truma_inetbox {
 
@@ -30,6 +38,28 @@ void TrumaiNetBoxApp::update() {
   this->heater_.update();
   this->timer_.update();
 
+  // Master mode auto-discovery (start device discovery once)
+  if (this->master_mode_ && !this->master_discovery_started_) {
+    this->master_discovery_started_ = true;
+    
+    ESP_LOGI(TAG, "Master mode: Starting discovery with CORRECT CP Plus signature 17 46 10 03");
+    
+    // Query identifier 0x23 with CORRECT CP Plus signature (17 46 10 03)
+    std::vector<uint8_t> query_23 = {0xB2, 0x23, 0x17, 0x46, 0x10, 0x03};
+    this->master_send_diag_single(0x7F, query_23);
+    this->master_send_diag_single(0x01, query_23); // Also try direct NAD
+    
+    // Query identifier 0x00 with CORRECT CP Plus signature (17 46 10 03)
+    std::vector<uint8_t> query_00 = {0xB2, 0x00, 0x17, 0x46, 0x10, 0x03};
+    this->master_send_diag_single(0x7F, query_00);
+    this->master_send_diag_single(0x01, query_00); // Also try direct NAD
+    
+    ESP_LOGI(TAG, "Master mode: Discovery sent - expecting heater response on PID 3D");
+  }
+
+  // UDP command receiver
+  this->process_udp_commands();
+
     // Master TX scheduler (throttle to ~20ms spacing)
   if (this->master_mode_ && !this->master_tx_queue_.empty()) {
     uint32_t now = micros();
@@ -54,6 +84,12 @@ void TrumaiNetBoxApp::update() {
 }
 
 const std::array<uint8_t, 4> TrumaiNetBoxApp::lin_identifier() {
+  // In master mode, identify as CP Plus instead of iNet Box
+  if (this->master_mode_) {
+    // CP Plus Combi identifier - act as the LIN master controller
+    return {0x17 /*Supplied Id*/, 0x46 /*Supplied Id*/, 0x00 /*Function Id*/, 0x04 /*CP Plus*/};
+  }
+  
   // Supplier Id: 0x4617 - Truma (Phone: +49 (0)89 4617-0)
   // Unknown:
   // 17.46.01.03 - old Combi model
@@ -446,4 +482,122 @@ 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;
+  }
+  
+  ESP_LOGI(TAG, "=== FIXED DISCOVERY SEQUENCE STARTED ===");
+  ESP_LOGI(TAG, "Using correct CP Plus signature 17 46 10 03 from UDP traffic analysis");
+  
+  // Target heater NAD (seen responding as NAD 0x01 in traffic)
+  uint8_t heater_nad = 0x01;
+  
+  // Also try broadcast for completeness
+  std::vector<uint8_t> nad_addresses = {0x7F, heater_nad};
+  
+  for (uint8_t nad : nad_addresses) {
+    ESP_LOGI(TAG, "Sending discovery to NAD 0x%02X:", nad);
+    
+    // 1. Query identifier 0x23 with CORRECT CP Plus signature (17 46 10 03)
+    std::vector<uint8_t> query_23 = {0xB2, 0x23, 0x17, 0x46, 0x10, 0x03};
+    this->master_send_diag_single(nad, query_23);
+    ESP_LOGI(TAG, "  -> B2 23 17 46 10 03 (CP Plus sig)");
+    
+    // 2. Query identifier 0x00 with CORRECT CP Plus signature (17 46 10 03) 
+    std::vector<uint8_t> query_00 = {0xB2, 0x00, 0x17, 0x46, 0x10, 0x03};
+    this->master_send_diag_single(nad, query_00);
+    ESP_LOGI(TAG, "  -> B2 00 17 46 10 03 (CP Plus sig)");
+  }
+  
+  ESP_LOGI(TAG, "=== DISCOVERY COMPLETED - HEATER SHOULD RESPOND ON PID 3D ===");
+}
+
+void TrumaiNetBoxApp::process_udp_commands() {
+  if (!this->master_mode_) return;
+  
+  // Initialize UDP command receiver socket on port 5556 (one port higher than stream)
+  if (this->udp_cmd_sock_ < 0 && !this->udp_cmd_init_attempted_) {
+    this->udp_cmd_init_attempted_ = true;
+    
+    this->udp_cmd_sock_ = socket(AF_INET, SOCK_DGRAM, 0);
+    if (this->udp_cmd_sock_ < 0) {
+      ESP_LOGW(TAG, "UDP command socket creation failed");
+      return;
+    }
+    
+    // Set non-blocking
+    int flags = fcntl(this->udp_cmd_sock_, F_GETFL, 0);
+    fcntl(this->udp_cmd_sock_, F_SETFL, flags | O_NONBLOCK);
+    
+    // Bind to port 5556
+    struct sockaddr_in addr;
+    memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addr.sin_port = htons(5556);
+    
+    if (bind(this->udp_cmd_sock_, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
+      ESP_LOGW(TAG, "UDP command socket bind failed");
+      close(this->udp_cmd_sock_);
+      this->udp_cmd_sock_ = -1;
+      return;
+    }
+    
+    ESP_LOGI(TAG, "UDP command receiver listening on port 5556");
+    ESP_LOGI(TAG, "Send commands like: 'CMD:B2 23 17 46 10 03 NAD:01'");
+  }
+  
+  // Check for incoming commands
+  if (this->udp_cmd_sock_ >= 0) {
+    char buffer[256];
+    struct sockaddr_in sender_addr;
+    socklen_t addr_len = sizeof(sender_addr);
+    
+    ssize_t len = recvfrom(this->udp_cmd_sock_, buffer, sizeof(buffer) - 1, 0, 
+                          (struct sockaddr*)&sender_addr, &addr_len);
+    
+    if (len > 0) {
+      buffer[len] = '\0';
+      std::string cmd(buffer);
+      
+      ESP_LOGI(TAG, "UDP Command received: %s", cmd.c_str());
+      
+      // Parse command format: "CMD:B2 23 17 46 10 03 NAD:01"
+      size_t cmd_pos = cmd.find("CMD:");
+      size_t nad_pos = cmd.find("NAD:");
+      
+      if (cmd_pos != std::string::npos && nad_pos != std::string::npos) {
+        std::string hex_data = cmd.substr(cmd_pos + 4, nad_pos - cmd_pos - 5);
+        std::string nad_str = cmd.substr(nad_pos + 4);
+        
+        // Parse NAD
+        uint8_t nad = (uint8_t)strtoul(nad_str.c_str(), nullptr, 16);
+        
+        // Parse hex bytes
+        std::vector<uint8_t> payload;
+        std::istringstream iss(hex_data);
+        std::string byte_str;
+        
+        while (iss >> byte_str) {
+          if (byte_str.length() == 2) {
+            uint8_t byte_val = (uint8_t)strtoul(byte_str.c_str(), nullptr, 16);
+            payload.push_back(byte_val);
+          }
+        }
+        
+        if (!payload.empty()) {
+          ESP_LOGI(TAG, "Sending diagnostic command to NAD 0x%02X with %zu bytes", nad, payload.size());
+          this->master_send_diag_single(nad, payload);
+        } else {
+          ESP_LOGW(TAG, "Failed to parse command payload");
+        }
+      } else {
+        ESP_LOGW(TAG, "Invalid command format. Use: CMD:B2 23 17 46 10 03 NAD:01");
+      }
+    }
+  }
+}
+
 } }

components/truma_inetbox/TrumaiNetBoxApp.h

@@ -31,6 +31,8 @@ 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();
+  void process_udp_commands();
 
   TRUMA_DEVICE get_heater_device() const { return this->heater_device_; }
   TRUMA_DEVICE get_aircon_device() const { return this->aircon_device_; }
@@ -93,6 +95,11 @@ class TrumaiNetBoxApp : public LinBusProtocol {
   struct MasterReq { uint8_t pid; uint8_t len; uint8_t data[9]; };
   std::queue<MasterReq> master_tx_queue_;
   uint32_t last_master_send_us_ = 0;
+  bool master_discovery_started_ = false;
+
+  // UDP command receiver socket
+  int udp_cmd_sock_ = -1;
+  bool udp_cmd_init_attempted_ = false;
 
 };
 

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))

tools/udp_cmd_sender.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""
+UDP Command Sender for Truma ESP32 Master Mode
+Sends diagnostic commands to ESP32 for dynamic testing
+"""
+
+import socket
+import sys
+import time
+
+def send_command(esp_ip, command, nad):
+    """Send a diagnostic command to ESP32"""
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    
+    # Format: "CMD:B2 23 17 46 10 03 NAD:01"
+    message = f"CMD:{command} NAD:{nad:02X}"
+    
+    print(f"Sending: {message}")
+    sock.sendto(message.encode(), (esp_ip, 5556))
+    sock.close()
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage:")
+        print("  python udp_cmd_sender.py <ESP32_IP> [command] [nad]")
+        print("")
+        print("Examples:")
+        print("  python udp_cmd_sender.py 192.168.1.90")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 23 17 46 10 03' 01")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 00 17 46 10 03' 01")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 00 17 46 40 03' 01")
+        print("")
+        print("Interactive mode if no command specified.")
+        return
+    
+    esp_ip = sys.argv[1]
+    
+    if len(sys.argv) >= 4:
+        # Single command mode
+        command = sys.argv[2]
+        nad = int(sys.argv[3], 16)
+        send_command(esp_ip, command, nad)
+    else:
+        # Interactive mode
+        print(f"UDP Command Sender - Connected to ESP32 at {esp_ip}:5556")
+        print("Commands will be sent to ESP32 and you should see responses on UDP port 5555")
+        print("")
+        print("Useful commands to try:")
+        print("  B2 23 17 46 10 03  (Query identifier 0x23 with CP Plus signature)")
+        print("  B2 00 17 46 10 03  (Query identifier 0x00 with CP Plus signature)")  
+        print("  B2 00 17 46 40 03  (Query identifier 0x00 with heater signature)")
+        print("  B2 00 17 46 01 03  (Query identifier 0x00 with old signature)")
+        print("")
+        print("Enter 'quit' to exit")
+        print("")
+        
+        while True:
+            try:
+                user_input = input("Enter command (hex bytes): ").strip()
+                if user_input.lower() in ['quit', 'exit', 'q']:
+                    break
+                
+                if not user_input:
+                    continue
+                
+                # Get NAD
+                nad_input = input("Enter NAD (hex, default 01): ").strip()
+                if not nad_input:
+                    nad = 1
+                else:
+                    nad = int(nad_input, 16)
+                
+                send_command(esp_ip, user_input, nad)
+                print("Command sent! Check UDP receiver for responses.")
+                print("")
+                
+            except KeyboardInterrupt:
+                break
+            except Exception as e:
+                print(f"Error: {e}")
+        
+        print("Goodbye!")
+
+if __name__ == "__main__":
+    main()

tools/udp_lin_receiver.py

@@ -77,6 +77,7 @@ def run():
     ap.add_argument("--duration", type=float, default=0.0, help="Stop after N seconds (0 = no limit)")
     ap.add_argument("--quiet", action="store_true", help="No console output, only CSV")
     ap.add_argument("--pid-diff", action="store_true", help="Track textual 'PID ..' lines and only print when data changes")
+    ap.add_argument("--suppress-repeats", action="store_true", help="Suppress repeated identical messages (shows first + count)")
     ap.add_argument("--buffer", type=int, default=4096, help="Receive buffer size (default: 4096)")
     args = ap.parse_args()
 
@@ -101,6 +102,9 @@ def run():
 
         start = time.time()
         last_by_pid: Dict[int, Tuple[int, ...]] = {}
+        last_message = None
+        repeat_count = 0
+        last_display_time = 0
 
         while True:
             if args.duration and (time.time() - start) >= args.duration:
@@ -129,6 +133,33 @@ def run():
 
             # Console output
             if not args.quiet:
+                # Format the display message
+                if is_text and as_text:
+                    display_msg = f"{ts} {src_ip}:{src_port} ({size}B) TEXT: {as_text}"
+                else:
+                    display_msg = f"{ts} {src_ip}:{src_port} ({size}B) HEX:  {hexstr}"
+                
+                # Handle repeat suppression
+                if args.suppress_repeats:
+                    current_msg_key = as_text if is_text else hexstr
+                    current_time = time.time()
+                    
+                    if current_msg_key == last_message:
+                        repeat_count += 1
+                        # Show periodic updates for long repeated sequences
+                        if current_time - last_display_time > 5.0:  # Every 5 seconds
+                            print(f"... repeated {repeat_count} times (last: {ts})")
+                            last_display_time = current_time
+                    else:
+                        # Message changed
+                        if repeat_count > 0:
+                            print(f"... repeated {repeat_count} times total")
+                        print(display_msg)
+                        last_message = current_msg_key
+                        repeat_count = 0
+                        last_display_time = current_time
+                    continue
+
                 if args.pid_diff and is_text:
                     parsed = maybe_parse_pid_and_data(as_text)
                     if parsed:
@@ -140,10 +171,7 @@ def run():
                         continue
 
                 # default console print
-                if is_text and as_text:
+                print(display_msg)
-                    print(f"{ts} {src_ip}:{src_port} ({size}B) TEXT: {as_text}")
-                else:
-                    print(f"{ts} {src_ip}:{src_port} ({size}B) HEX:  {hexstr}")
 
 
 if __name__ == "__main__":