add CP Plus identifier for master mode in lin_identifier function

components/truma_inetbox/TrumaiNetBoxApp.cpp

@@ -76,6 +76,12 @@ 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