diff --git a/examples/companion_radio/UITask.cpp b/examples/companion_radio/UITask.cpp
index b454d939..c42bb094 100644
--- a/examples/companion_radio/UITask.cpp
+++ b/examples/companion_radio/UITask.cpp
@@ -25,7 +25,8 @@ static const uint8_t meshcore_logo [] PROGMEM = {
     0xe3, 0xe3, 0x8f, 0xff, 0x1f, 0xfc, 0x3c, 0x0e, 0x1f, 0xf8, 0xff, 0xf8, 0x70, 0x3c, 0x7f, 0xf8, 
 };
 
-void UITask::begin(const char* node_name, const char* build_date, uint32_t pin_code) {
+void UITask::begin(DisplayDriver* display, const char* node_name, const char* build_date, uint32_t pin_code) {
+  _display = display;
   _auto_off = millis() + AUTO_OFF_MILLIS;
   clearMsgPreview();
   _node_name = node_name;
diff --git a/examples/companion_radio/UITask.h b/examples/companion_radio/UITask.h
index 4cea0b8d..a0c60186 100644
--- a/examples/companion_radio/UITask.h
+++ b/examples/companion_radio/UITask.h
@@ -2,6 +2,7 @@
 
 #include <MeshCore.h>
 #include <helpers/ui/DisplayDriver.h>
+#include <stddef.h>
 
 class UITask {
   DisplayDriver* _display;
@@ -21,13 +22,14 @@ class UITask {
 
 public:
 
-  UITask(mesh::MainBoard* board, DisplayDriver* display) : _board(board), _display(display){ 
+  UITask(mesh::MainBoard* board) : _board(board), _display(NULL) {
       _next_refresh = 0; 
       _connected = false;
   }
-  void begin(const char* node_name, const char* build_date, uint32_t pin_code);
+  void begin(DisplayDriver* display, const char* node_name, const char* build_date, uint32_t pin_code);
 
   void setHasConnection(bool connected) { _connected = connected; }
+  bool hasDisplay() const { return _display != NULL; }
   void clearMsgPreview();
   void msgRead(int msgcount);
   void newMsg(uint8_t path_len, const char* from_name, const char* text, int msgcount);
diff --git a/examples/companion_radio/main.cpp b/examples/companion_radio/main.cpp
index 05260c43..e2fcc202 100644
--- a/examples/companion_radio/main.cpp
+++ b/examples/companion_radio/main.cpp
@@ -109,12 +109,13 @@
   #include <helpers/ui/SSD1306Display.h>
 
   static DISPLAY_CLASS  display;
-  static UITask ui_task(&board, &display);
   #define HAS_UI
-#elif defined(HAS_UI)
+#endif
+
+#if defined(HAS_UI)
   #include "UITask.h"
 
-  static UITask ui_task(&board, NULL);
+  static UITask ui_task(&board);
 #endif
 
 // Believe it or not, this std C function is busted on some platforms!
@@ -171,6 +172,9 @@ static uint32_t _atoi(const char* sp) {
 #define CMD_GET_CONTACT_BY_KEY    30
 #define CMD_GET_CHANNEL           31
 #define CMD_SET_CHANNEL           32
+#define CMD_SIGN_START            33
+#define CMD_SIGN_DATA             34
+#define CMD_SIGN_FINISH           35
 
 #define RESP_CODE_OK                0
 #define RESP_CODE_ERR               1
@@ -191,6 +195,8 @@ static uint32_t _atoi(const char* sp) {
 #define RESP_CODE_CONTACT_MSG_RECV_V3  16   // a reply to CMD_SYNC_NEXT_MESSAGE (ver >= 3)
 #define RESP_CODE_CHANNEL_MSG_RECV_V3  17   // a reply to CMD_SYNC_NEXT_MESSAGE (ver >= 3)
 #define RESP_CODE_CHANNEL_INFO     18   // a reply to CMD_GET_CHANNEL
+#define RESP_CODE_SIGN_START       19
+#define RESP_CODE_SIGNATURE        20
 
 // these are _pushed_ to client app at any time
 #define PUSH_CODE_ADVERT            0x80
@@ -205,6 +211,8 @@ static uint32_t _atoi(const char* sp) {
 
 /* -------------------------------------------------------------------------------------- */
 
+#define MAX_SIGN_DATA_LEN    (8*1024)   // 8K
+
 struct NodePrefs {  // persisted to file
   float airtime_factor;
   char node_name[32];
@@ -235,6 +243,8 @@ class MyMesh : public BaseChatMesh {
   uint32_t _active_ble_pin;
   bool  _iter_started;
   uint8_t app_target_ver;
+  uint8_t* sign_data;
+  uint32_t sign_data_len;
   uint8_t cmd_frame[MAX_FRAME_SIZE+1];
   uint8_t out_frame[MAX_FRAME_SIZE+1];
 
@@ -726,6 +736,7 @@ public:
     _identity_store = NULL;
     pending_login = pending_status = 0;
     next_ack_idx = 0;
+    sign_data = NULL;
 
     // defaults
     memset(&_prefs, 0, sizeof(_prefs));
@@ -739,7 +750,7 @@ public:
     //_prefs.rx_delay_base = 10.0f;  enable once new algo fixed
   }
 
-  void begin(FILESYSTEM& fs, mesh::RNG& trng) {
+  void begin(FILESYSTEM& fs, mesh::RNG& trng, bool has_display) {
     _fs = &fs;
 
     BaseChatMesh::begin();
@@ -790,8 +801,12 @@ public:
 
   #ifdef BLE_PIN_CODE
     if (_prefs.ble_pin == 0) {
-    #ifdef DISPLAY_CLASS
-      _active_ble_pin = trng.nextInt(100000, 999999);  // random pin each session
+    #ifdef HAS_UI
+      if (has_display) {
+        _active_ble_pin = trng.nextInt(100000, 999999);  // random pin each session
+      } else {
+        _active_ble_pin = BLE_PIN_CODE;  // otherwise static pin
+      }
     #else
       _active_ble_pin = BLE_PIN_CODE;  // otherwise static pin
     #endif
@@ -1294,6 +1309,38 @@ public:
       } else {
         writeErrFrame();
       }
+    } else if (cmd_frame[0] == CMD_SIGN_START) {
+      out_frame[0] = RESP_CODE_SIGN_START;
+      out_frame[1] = 0;  // reserved
+      uint32_t len = MAX_SIGN_DATA_LEN;
+      memcpy(&out_frame[2], &len, 4);
+      _serial->writeFrame(out_frame, 6);
+
+      if (sign_data) {
+        free(sign_data);
+      }
+      sign_data = (uint8_t *) malloc(MAX_SIGN_DATA_LEN);
+      sign_data_len = 0;
+    } else if (cmd_frame[0] == CMD_SIGN_DATA && len > 1) {
+      if (sign_data == NULL || sign_data_len + (len - 1) > MAX_SIGN_DATA_LEN) {
+        writeErrFrame();  // error: too long
+      } else {
+        memcpy(&sign_data[sign_data_len], &cmd_frame[1], len - 1);
+        sign_data_len += (len - 1);
+        writeOKFrame();
+      }
+    } else if (cmd_frame[0] == CMD_SIGN_FINISH) {
+      if (sign_data) {
+        self_id.sign(&out_frame[1], sign_data, sign_data_len);
+
+        free(sign_data);  // don't need sign_data now
+        sign_data = NULL;
+
+        out_frame[0] = RESP_CODE_SIGNATURE;
+        _serial->writeFrame(out_frame, 1 + SIGNATURE_SIZE);
+      } else {
+        writeErrFrame();
+      }
     } else {
       writeErrFrame();
       MESH_DEBUG_PRINTLN("ERROR: unknown command: %02X", cmd_frame[0]);
@@ -1425,9 +1472,24 @@ void setup() {
 
   RadioNoiseListener trng(radio);
 
+#ifdef HAS_UI
+  DisplayDriver* disp = NULL;
+ #ifdef DISPLAY_CLASS
+  if (display.begin()) {
+    disp = &display;
+  }
+ #endif
+#endif
+
 #if defined(NRF52_PLATFORM)
   InternalFS.begin();
-  the_mesh.begin(InternalFS, trng);
+  the_mesh.begin(InternalFS, trng,
+    #ifdef HAS_UI
+        disp != NULL
+    #else
+        false
+    #endif
+  );
 
 #ifdef BLE_PIN_CODE
   char dev_name[32+16];
@@ -1439,7 +1501,13 @@ void setup() {
   the_mesh.startInterface(serial_interface);
 #elif defined(ESP32)
   SPIFFS.begin(true);
-  the_mesh.begin(SPIFFS, trng);
+  the_mesh.begin(SPIFFS, trng,
+    #ifdef HAS_UI
+        disp != NULL
+    #else
+        false
+    #endif
+  );
 
 #ifdef WIFI_SSID
   WiFi.begin(WIFI_SSID, WIFI_PWD);
@@ -1456,11 +1524,8 @@ void setup() {
   #error "need to define filesystem"
 #endif
 
-#ifdef DISPLAY_CLASS
-  display.begin();
-#endif
 #ifdef HAS_UI
-  ui_task.begin(the_mesh.getNodeName(), FIRMWARE_BUILD_DATE, the_mesh.getBLEPin());
+  ui_task.begin(disp, the_mesh.getNodeName(), FIRMWARE_BUILD_DATE, the_mesh.getBLEPin());
 #endif
 }
 
diff --git a/examples/simple_room_server/main.cpp b/examples/simple_room_server/main.cpp
index e2572613..23bcb2c0 100644
--- a/examples/simple_room_server/main.cpp
+++ b/examples/simple_room_server/main.cpp
@@ -71,12 +71,16 @@
   #include <helpers/HeltecV3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   static HeltecV3Board board;
+#elif defined(HELTEC_LORA_V2)
+  #include <helpers/HeltecV2Board.h>
+  #include <helpers/CustomSX1276Wrapper.h>
+  static HeltecV2Board board;
 #elif defined(ARDUINO_XIAO_ESP32C3)
   #include <helpers/XiaoC3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   #include <helpers/CustomSX1268Wrapper.h>
   static XiaoC3Board board;
-#elif defined(SEEED_XIAO_S3)
+#elif defined(SEEED_XIAO_S3) || defined(LILYGO_T3S3)
   #include <helpers/ESP32Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   static ESP32Board board;
diff --git a/platformio.ini b/platformio.ini
index 2b118561..a515f1da 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -42,16 +42,24 @@ board = heltec_wifi_lora_32_V2   ; heltec_wifi_lora_32_V2
 build_flags =
   ${esp32_base.build_flags}
   -D HELTEC_LORA_V2
+  -D PIN_BOARD_SDA=4
+  -D PIN_BOARD_SCL=15
+  -D PIN_USER_BTN=0
+  -D PIN_OLED_RESET=16
   -D RADIO_CLASS=CustomSX1276
   -D WRAPPER_CLASS=CustomSX1276Wrapper
   -D LORA_TX_POWER=20
   -D P_LORA_TX_LED=25
 build_src_filter = ${esp32_base.build_src_filter}
+lib_deps =
+  ${esp32_base.lib_deps}
+  adafruit/Adafruit SSD1306 @ ^2.5.13
 
 [env:Heltec_v2_repeater]
 extends = Heltec_lora32_v2
 build_flags =
   ${Heltec_lora32_v2.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D ADVERT_NAME='"Heltec Repeater"'
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
@@ -59,7 +67,24 @@ build_flags =
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${Heltec_lora32_v2.build_src_filter}
-  +<../examples/simple_repeater/main.cpp>
+  +<../examples/simple_repeater>
+  +<helpers/ui/*.cpp>
+
+[env:Heltec_v2_room_server]
+extends = Heltec_lora32_v2
+build_flags =
+  ${Heltec_lora32_v2.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
+  -D ADVERT_NAME='"Heltec Room"'
+  -D ADVERT_LAT=-37.0
+  -D ADVERT_LON=145.0
+  -D ADMIN_PASSWORD='"password"'
+  -D ROOM_PASSWORD='"hello"'
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${Heltec_lora32_v2.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_room_server>
 
 [env:Heltec_v2_terminal_chat]
 extends = Heltec_lora32_v2
@@ -79,13 +104,15 @@ lib_deps =
 extends = Heltec_lora32_v2
 build_flags =
   ${Heltec_lora32_v2.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
 ; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
 ; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
 build_src_filter = ${Heltec_lora32_v2.build_src_filter}
   +<helpers/esp32/*.cpp>
-  +<../examples/companion_radio/main.cpp>
+  +<helpers/ui/*.cpp>
+  +<../examples/companion_radio>
 lib_deps =
   ${Heltec_lora32_v2.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -94,9 +121,10 @@ lib_deps =
 extends = Heltec_lora32_v2
 build_flags =
   ${Heltec_lora32_v2.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
-  -D BLE_PIN_CODE=123456
+  -D BLE_PIN_CODE=0
   -D BLE_DEBUG_LOGGING=1
 ;  -D ENABLE_PRIVATE_KEY_IMPORT=1
 ;  -D ENABLE_PRIVATE_KEY_EXPORT=1
@@ -104,7 +132,8 @@ build_flags =
 ;  -D MESH_DEBUG=1
 build_src_filter = ${Heltec_lora32_v2.build_src_filter}
   +<helpers/esp32/*.cpp>
-  +<../examples/companion_radio/main.cpp>
+  +<helpers/ui/*.cpp>
+  +<../examples/companion_radio>
 lib_deps =
   ${Heltec_lora32_v2.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -130,7 +159,7 @@ build_flags =
 build_src_filter = ${esp32_base.build_src_filter}
 lib_deps =
   ${esp32_base.lib_deps}
-	adafruit/Adafruit SSD1306 @ ^2.5.13
+  adafruit/Adafruit SSD1306 @ ^2.5.13
 
 [env:Heltec_v3_repeater]
 extends = Heltec_lora32_v3
@@ -149,9 +178,6 @@ build_src_filter = ${Heltec_lora32_v3.build_src_filter}
 
 [env:Heltec_v3_room_server]
 extends = Heltec_lora32_v3
-build_src_filter = ${Heltec_lora32_v3.build_src_filter}
-  +<helpers/ui/*.cpp>
-  +<../examples/simple_room_server>
 build_flags =
   ${Heltec_lora32_v3.build_flags}
   -D DISPLAY_CLASS=SSD1306Display
@@ -162,6 +188,9 @@ build_flags =
   -D ROOM_PASSWORD='"hello"'
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+build_src_filter = ${Heltec_lora32_v3.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_room_server>
 
 [env:Heltec_v3_terminal_chat]
 extends = Heltec_lora32_v3
@@ -522,7 +551,8 @@ build_flags =
 [LilyGo_T3S3_sx1262]
 extends = esp32_base
 board = t3_s3_v1_x
-build_flags = ${esp32_base.build_flags}
+build_flags =
+  ${esp32_base.build_flags}
   -D LILYGO_T3S3
   -D P_LORA_DIO_1=33
   -D P_LORA_NSS=7
@@ -533,6 +563,11 @@ build_flags = ${esp32_base.build_flags}
   -D P_LORA_MOSI=6
   -D P_LORA_TX_LED=37
   -D PIN_VBAT_READ=1
+  -D PIN_USER_BTN=0
+  -D PIN_BOARD_SDA=18
+  -D PIN_BOARD_SCL=17
+  -D P_LORA_TX_LED=37
+  -D PIN_OLED_RESET=21
   -D SX126X_DIO2_AS_RF_SWITCH=true
   -D SX126X_DIO3_TCXO_VOLTAGE=1.8
   -D SX126X_CURRENT_LIMIT=130
@@ -540,20 +575,26 @@ build_flags = ${esp32_base.build_flags}
   -D WRAPPER_CLASS=CustomSX1262Wrapper
   -D LORA_TX_POWER=22
   -D SX126X_RX_BOOSTED_GAIN=1
+build_src_filter = ${esp32_base.build_src_filter}
+lib_deps =
+  ${esp32_base.lib_deps}
+  adafruit/Adafruit SSD1306 @ ^2.5.13
 
 ; === LilyGo T3S3 with SX1262 environments ===
 [env:LilyGo_T3S3_sx1262_Repeater]
 extends = LilyGo_T3S3_sx1262
-build_src_filter = ${LilyGo_T3S3_sx1262.build_src_filter}
-  +<../examples/simple_repeater/main.cpp>
 build_flags =
   ${LilyGo_T3S3_sx1262.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D ADVERT_NAME='"T3S3-1262 Repeater"'
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
   -D ADMIN_PASSWORD='"password"'
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+build_src_filter = ${LilyGo_T3S3_sx1262.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_repeater>
 
 [env:LilyGo_T3S3_sx1262_terminal_chat]
 extends = LilyGo_T3S3_sx1262
@@ -569,10 +610,27 @@ lib_deps =
   ${LilyGo_T3S3_sx1262.lib_deps}
   densaugeo/base64 @ ~1.4.0
 
+[env:LilyGo_T3S3_sx1262_room_server]
+extends = LilyGo_T3S3_sx1262
+build_flags =
+  ${LilyGo_T3S3_sx1262.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
+  -D ADVERT_NAME='"T3S3-1262 Room"'
+  -D ADVERT_LAT=-37.0
+  -D ADVERT_LON=145.0
+  -D ADMIN_PASSWORD='"password"'
+  -D ROOM_PASSWORD='"hello"'
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${LilyGo_T3S3_sx1262.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_room_server>
+
 [env:LilyGo_T3S3_sx1262_companion_radio_usb]
 extends = LilyGo_T3S3_sx1262
 build_flags =
   ${LilyGo_T3S3_sx1262.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
 ;  -D ENABLE_PRIVATE_KEY_IMPORT=1
@@ -580,7 +638,8 @@ build_flags =
 ; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
 ; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
 build_src_filter = ${LilyGo_T3S3_sx1262.build_src_filter}
-  +<../examples/companion_radio/main.cpp>
+  +<helpers/ui/*.cpp>
+  +<../examples/companion_radio>
 lib_deps =
   ${LilyGo_T3S3_sx1262.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -589,6 +648,7 @@ lib_deps =
 extends = LilyGo_T3S3_sx1262
 build_flags =
   ${LilyGo_T3S3_sx1262.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
   -D BLE_PIN_CODE=123456
@@ -599,7 +659,8 @@ build_flags =
 ;  -D MESH_DEBUG=1
 build_src_filter = ${LilyGo_T3S3_sx1262.build_src_filter}
   +<helpers/esp32/*.cpp>
-  +<../examples/companion_radio/main.cpp>
+  +<helpers/ui/*.cpp>
+  +<../examples/companion_radio>
 lib_deps =
   ${LilyGo_T3S3_sx1262.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -674,35 +735,40 @@ extends = nrf52840_base
 platform = https://github.com/maxgerhardt/platform-nordicnrf52.git#rak
 board = wiscore_rak4631
 board_check = true
-build_src_filter = ${nrf52840_base.build_src_filter}
-  +<helpers/nrf52/*.cpp>
 build_flags = ${nrf52840_base.build_flags}
   -D RAK_4631
+  -D PIN_USER_BTN=9
   -D RADIO_CLASS=CustomSX1262
   -D WRAPPER_CLASS=CustomSX1262Wrapper
   -D LORA_TX_POWER=22
   -D SX126X_CURRENT_LIMIT=130
   -D SX126X_RX_BOOSTED_GAIN=1
+build_src_filter = ${nrf52840_base.build_src_filter}
+  +<helpers/nrf52/*.cpp>
+lib_deps =
+  ${nrf52840_base.lib_deps}
+  adafruit/Adafruit SSD1306 @ ^2.5.13
 
 [env:RAK_4631_Repeater]
 extends = rak4631
-build_src_filter = ${rak4631.build_src_filter}
-  +<../examples/simple_repeater/main.cpp>
 build_flags =
   ${rak4631.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D ADVERT_NAME='"RAK4631 Repeater"'
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
   -D ADMIN_PASSWORD='"password"'
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+build_src_filter = ${rak4631.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_repeater>
 
 [env:RAK_4631_room_server]
 extends = rak4631
-build_src_filter = ${rak4631.build_src_filter}
-  +<../examples/simple_room_server/main.cpp>
 build_flags =
   ${rak4631.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
   -D ADVERT_NAME='"Test Room"'
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
@@ -710,6 +776,48 @@ build_flags =
   -D ROOM_PASSWORD='"hello"'
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+build_src_filter = ${rak4631.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/simple_room_server>
+
+[env:RAK_4631_companion_radio_usb]
+extends = rak4631
+build_flags =
+  ${rak4631.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
+  -D MAX_CONTACTS=100
+  -D MAX_GROUP_CHANNELS=8
+;  -D ENABLE_PRIVATE_KEY_IMPORT=1
+;  -D ENABLE_PRIVATE_KEY_EXPORT=1
+; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
+; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
+build_src_filter = ${rak4631.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<../examples/companion_radio>
+lib_deps =
+  ${rak4631.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+[env:RAK_4631_companion_radio_ble]
+extends = rak4631
+build_flags =
+  ${rak4631.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
+  -D MAX_CONTACTS=100
+  -D MAX_GROUP_CHANNELS=8
+  -D BLE_PIN_CODE=123456
+  -D BLE_DEBUG_LOGGING=1
+;  -D ENABLE_PRIVATE_KEY_IMPORT=1
+;  -D ENABLE_PRIVATE_KEY_EXPORT=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${rak4631.build_src_filter}
+  +<helpers/ui/*.cpp>
+  +<helpers/nrf52/*.cpp>
+  +<../examples/companion_radio>
+lib_deps =
+  ${rak4631.lib_deps}
+  densaugeo/base64 @ ~1.4.0
 
 [env:RAK_4631_terminal_chat]
 extends = rak4631
@@ -725,41 +833,6 @@ lib_deps =
   ${rak4631.lib_deps}
   densaugeo/base64 @ ~1.4.0
 
-[env:RAK_4631_companion_radio_usb]
-extends = rak4631
-build_flags =
-  ${rak4631.build_flags}
-  -D MAX_CONTACTS=100
-  -D MAX_GROUP_CHANNELS=8
-;  -D ENABLE_PRIVATE_KEY_IMPORT=1
-;  -D ENABLE_PRIVATE_KEY_EXPORT=1
-; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
-; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
-build_src_filter = ${rak4631.build_src_filter}
-  +<../examples/companion_radio/main.cpp>
-lib_deps =
-  ${rak4631.lib_deps}
-  densaugeo/base64 @ ~1.4.0
-
-[env:RAK_4631_companion_radio_ble]
-extends = rak4631
-build_flags =
-  ${rak4631.build_flags}
-  -D MAX_CONTACTS=100
-  -D MAX_GROUP_CHANNELS=8
-  -D BLE_PIN_CODE=123456
-  -D BLE_DEBUG_LOGGING=1
-;  -D ENABLE_PRIVATE_KEY_IMPORT=1
-;  -D ENABLE_PRIVATE_KEY_EXPORT=1
-;  -D MESH_PACKET_LOGGING=1
-;  -D MESH_DEBUG=1
-build_src_filter = ${rak4631.build_src_filter}
-  +<helpers/nrf52/*.cpp>
-  +<../examples/companion_radio/main.cpp>
-lib_deps =
-  ${rak4631.lib_deps}
-  densaugeo/base64 @ ~1.4.0
-
 ; ----------------- NRF52 T1000e---------------------
 [nrf52840_t1000e]
 extends = nrf52_base
@@ -979,7 +1052,7 @@ build_flags = ${nrf52840_base.build_flags}
 extends = faketec
 build_src_filter = ${faketec.build_src_filter} +<../examples/simple_repeater/main.cpp>
 build_flags =
-  ${faketec.build_flags} 
+  ${faketec.build_flags}
   -D ADVERT_NAME="\"Faketec Repeater\""
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
@@ -994,7 +1067,7 @@ lib_deps =
 extends = faketec
 build_src_filter = ${faketec.build_src_filter} +<../examples/simple_room_server/main.cpp>
 build_flags =
-  ${faketec.build_flags} 
+  ${faketec.build_flags}
   -D ADVERT_NAME="\"Test Room\""
   -D ADVERT_LAT=-37.0
   -D ADVERT_LON=145.0
@@ -1009,7 +1082,7 @@ lib_deps =
 [env:Faketec_terminal_chat]
 extends = faketec
 build_flags =
-  ${faketec.build_flags} 
+  ${faketec.build_flags}
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=1
 ;  -D MESH_PACKET_LOGGING=1
@@ -1023,7 +1096,7 @@ lib_deps =
 [env:Faketec_companion_radio_usb]
 extends = faketec
 build_flags =
-  ${faketec.build_flags} 
+  ${faketec.build_flags}
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
 ; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
@@ -1037,7 +1110,7 @@ lib_deps =
 [env:Faketec_companion_radio_ble]
 extends = faketec
 build_flags =
-  ${faketec.build_flags} 
+  ${faketec.build_flags}
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
   -D BLE_PIN_CODE=123456
diff --git a/src/helpers/nrf52/RAK4631Board.cpp b/src/helpers/nrf52/RAK4631Board.cpp
index dc92f691..f15e7a6c 100644
--- a/src/helpers/nrf52/RAK4631Board.cpp
+++ b/src/helpers/nrf52/RAK4631Board.cpp
@@ -6,75 +6,75 @@
 
 static BLEDfu bledfu;
 
-static void connect_callback(uint16_t conn_handle)
-{
-    (void)conn_handle;
-    MESH_DEBUG_PRINTLN("BLE client connected");
+static void connect_callback(uint16_t conn_handle) {
+  (void)conn_handle;
+  MESH_DEBUG_PRINTLN("BLE client connected");
 }
 
-static void disconnect_callback(uint16_t conn_handle, uint8_t reason)
-{
-    (void)conn_handle;
-    (void)reason;
+static void disconnect_callback(uint16_t conn_handle, uint8_t reason) {
+  (void)conn_handle;
+  (void)reason;
 
-    MESH_DEBUG_PRINTLN("BLE client disconnected");
+  MESH_DEBUG_PRINTLN("BLE client disconnected");
 }
 
 void RAK4631Board::begin() {
   // for future use, sub-classes SHOULD call this from their begin()
   startup_reason = BD_STARTUP_NORMAL;
-
   pinMode(PIN_VBAT_READ, INPUT);
+#ifdef PIN_USER_BTN
+  pinMode(PIN_USER_BTN, INPUT_PULLUP);
+#endif
 
 #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
-  Wire.begin(PIN_BOARD_SDA, PIN_BOARD_SCL);
-#else
-  Wire.begin();
+  Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL)
 #endif
 
+  Wire.begin();
+
   pinMode(SX126X_POWER_EN, OUTPUT);
   digitalWrite(SX126X_POWER_EN, HIGH);
   delay(10);   // give sx1262 some time to power up
 }
 
 bool RAK4631Board::startOTAUpdate() {
-    // Config the peripheral connection with maximum bandwidth
-    // more SRAM required by SoftDevice
-    // Note: All config***() function must be called before begin()
-    Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
-    Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
+  // Config the peripheral connection with maximum bandwidth
+  // more SRAM required by SoftDevice
+  // Note: All config***() function must be called before begin()
+  Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
+  Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
 
-    Bluefruit.begin(1, 0);
-    // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
-    Bluefruit.setTxPower(4);
-    // Set the BLE device name
-    Bluefruit.setName("RAK4631_OTA");
+  Bluefruit.begin(1, 0);
+  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
+  Bluefruit.setTxPower(4);
+  // Set the BLE device name
+  Bluefruit.setName("RAK4631_OTA");
 
-    Bluefruit.Periph.setConnectCallback(connect_callback);
-    Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
+  Bluefruit.Periph.setConnectCallback(connect_callback);
+  Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
 
-    // To be consistent OTA DFU should be added first if it exists
-    bledfu.begin();
+  // To be consistent OTA DFU should be added first if it exists
+  bledfu.begin();
 
-    // Set up and start advertising
-    // Advertising packet
-    Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
-    Bluefruit.Advertising.addTxPower();
-    Bluefruit.Advertising.addName();
+  // Set up and start advertising
+  // Advertising packet
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addName();
 
-    /* Start Advertising
-     - Enable auto advertising if disconnected
-     - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
-     - Timeout for fast mode is 30 seconds
-     - Start(timeout) with timeout = 0 will advertise forever (until connected)
+  /* Start Advertising
+    - Enable auto advertising if disconnected
+    - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+    - Timeout for fast mode is 30 seconds
+    - Start(timeout) with timeout = 0 will advertise forever (until connected)
 
-     For recommended advertising interval
-     https://developer.apple.com/library/content/qa/qa1931/_index.html
-    */
-    Bluefruit.Advertising.restartOnDisconnect(true);
-    Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
-    Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
-    Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
+    For recommended advertising interval
+    https://developer.apple.com/library/content/qa/qa1931/_index.html
+  */
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
+  Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
 
   return true;
 }
diff --git a/src/helpers/nrf52/T1000eBoard.cpp b/src/helpers/nrf52/T1000eBoard.cpp
index bcf787dc..bccbef68 100644
--- a/src/helpers/nrf52/T1000eBoard.cpp
+++ b/src/helpers/nrf52/T1000eBoard.cpp
@@ -4,8 +4,7 @@
 
 #include <bluefruit.h>
 
-void T1000eBoard::begin()
-  {
+void T1000eBoard::begin() {
   // for future use, sub-classes SHOULD call this from their begin()
   startup_reason = BD_STARTUP_NORMAL;
   btn_prev_state = HIGH;
@@ -17,70 +16,68 @@ void T1000eBoard::begin()
 #endif
 
 #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
-  Wire.begin(PIN_BOARD_SDA, PIN_BOARD_SCL);
-#else
-  Wire.begin();
+  Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL)
 #endif
 
+  Wire.begin();
+
   delay(10);   // give sx1262 some time to power up
 }
 
 #if 0
 static BLEDfu bledfu;
 
-static void connect_callback(uint16_t conn_handle)
-{
-    (void)conn_handle;
-    MESH_DEBUG_PRINTLN("BLE client connected");
+static void connect_callback(uint16_t conn_handle) {
+  (void)conn_handle;
+  MESH_DEBUG_PRINTLN("BLE client connected");
 }
 
-static void disconnect_callback(uint16_t conn_handle, uint8_t reason)
-{
-    (void)conn_handle;
-    (void)reason;
+static void disconnect_callback(uint16_t conn_handle, uint8_t reason) {
+  (void)conn_handle;
+  (void)reason;
 
-    MESH_DEBUG_PRINTLN("BLE client disconnected");
+  MESH_DEBUG_PRINTLN("BLE client disconnected");
 }
 
 
 bool TrackerT1000eBoard::startOTAUpdate() {
-    // Config the peripheral connection with maximum bandwidth
-    // more SRAM required by SoftDevice
-    // Note: All config***() function must be called before begin()
-    Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
-    Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
+  // Config the peripheral connection with maximum bandwidth
+  // more SRAM required by SoftDevice
+  // Note: All config***() function must be called before begin()
+  Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
+  Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
 
-    Bluefruit.begin(1, 0);
-    // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
-    Bluefruit.setTxPower(4);
-    // Set the BLE device name
-    Bluefruit.setName("T1000E_OTA");
+  Bluefruit.begin(1, 0);
+  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
+  Bluefruit.setTxPower(4);
+  // Set the BLE device name
+  Bluefruit.setName("T1000E_OTA");
 
-    Bluefruit.Periph.setConnectCallback(connect_callback);
-    Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
+  Bluefruit.Periph.setConnectCallback(connect_callback);
+  Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
 
-    // To be consistent OTA DFU should be added first if it exists
-    bledfu.begin();
+  // To be consistent OTA DFU should be added first if it exists
+  bledfu.begin();
 
-    // Set up and start advertising
-    // Advertising packet
-    Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
-    Bluefruit.Advertising.addTxPower();
-    Bluefruit.Advertising.addName();
+  // Set up and start advertising
+  // Advertising packet
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addName();
 
-    /* Start Advertising
-     - Enable auto advertising if disconnected
-     - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
-     - Timeout for fast mode is 30 seconds
-     - Start(timeout) with timeout = 0 will advertise forever (until connected)
+  /* Start Advertising
+    - Enable auto advertising if disconnected
+    - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+    - Timeout for fast mode is 30 seconds
+    - Start(timeout) with timeout = 0 will advertise forever (until connected)
 
-     For recommended advertising interval
-     https://developer.apple.com/library/content/qa/qa1931/_index.html
-    */
-    Bluefruit.Advertising.restartOnDisconnect(true);
-    Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
-    Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
-    Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
+    For recommended advertising interval
+    https://developer.apple.com/library/content/qa/qa1931/_index.html
+  */
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
+  Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
 
   return true;
 }
diff --git a/src/helpers/nrf52/T114Board.cpp b/src/helpers/nrf52/T114Board.cpp
index d3d93999..da1a022d 100644
--- a/src/helpers/nrf52/T114Board.cpp
+++ b/src/helpers/nrf52/T114Board.cpp
@@ -27,11 +27,11 @@ void T114Board::begin() {
   pinMode(PIN_VBAT_READ, INPUT);
 
 #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
-  Wire.begin(PIN_BOARD_SDA, PIN_BOARD_SCL);
-#else
-  Wire.begin();
+  Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL)
 #endif
 
+  Wire.begin();
+
 #ifdef P_LORA_TX_LED
   pinMode(P_LORA_TX_LED, OUTPUT);
   digitalWrite(P_LORA_TX_LED, HIGH);
diff --git a/src/helpers/nrf52/TechoBoard.cpp b/src/helpers/nrf52/TechoBoard.cpp
index 4af88661..3f0936ba 100644
--- a/src/helpers/nrf52/TechoBoard.cpp
+++ b/src/helpers/nrf52/TechoBoard.cpp
@@ -6,14 +6,12 @@
 
 static BLEDfu bledfu;
 
-static void connect_callback(uint16_t conn_handle)
-{
+static void connect_callback(uint16_t conn_handle) {
   (void)conn_handle;
   MESH_DEBUG_PRINTLN("BLE client connected");
 }
 
-static void disconnect_callback(uint16_t conn_handle, uint8_t reason)
-{
+static void disconnect_callback(uint16_t conn_handle, uint8_t reason) {
   (void)conn_handle;
   (void)reason;
 
@@ -27,11 +25,11 @@ void TechoBoard::begin() {
   pinMode(PIN_VBAT_READ, INPUT);
 
 #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
-  Wire.begin(PIN_BOARD_SDA, PIN_BOARD_SCL);
-#else
-  Wire.begin();
+  Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL)
 #endif
 
+  Wire.begin();
+
   pinMode(SX126X_POWER_EN, OUTPUT);
   digitalWrite(SX126X_POWER_EN, HIGH);
   delay(10);   // give sx1262 some time to power up
diff --git a/src/helpers/nrf52/faketecBoard.cpp b/src/helpers/nrf52/faketecBoard.cpp
index 6ef294bc..43bbe772 100644
--- a/src/helpers/nrf52/faketecBoard.cpp
+++ b/src/helpers/nrf52/faketecBoard.cpp
@@ -6,58 +6,56 @@
 
 static BLEDfu bledfu;
 
-static void connect_callback(uint16_t conn_handle)
-{
-    (void)conn_handle;
-    MESH_DEBUG_PRINTLN("BLE client connected");
+static void connect_callback(uint16_t conn_handle) {
+  (void)conn_handle;
+  MESH_DEBUG_PRINTLN("BLE client connected");
 }
 
-static void disconnect_callback(uint16_t conn_handle, uint8_t reason)
-{
-    (void)conn_handle;
-    (void)reason;
+static void disconnect_callback(uint16_t conn_handle, uint8_t reason) {
+  (void)conn_handle;
+  (void)reason;
 
-    MESH_DEBUG_PRINTLN("BLE client disconnected");
+  MESH_DEBUG_PRINTLN("BLE client disconnected");
 }
 
 bool faketecBoard::startOTAUpdate() {
-    // Config the peripheral connection with maximum bandwidth
-    // more SRAM required by SoftDevice
-    // Note: All config***() function must be called before begin()
-    Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
-    Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
+  // Config the peripheral connection with maximum bandwidth
+  // more SRAM required by SoftDevice
+  // Note: All config***() function must be called before begin()
+  Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
+  Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);
 
-    Bluefruit.begin(1, 0);
-    // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
-    Bluefruit.setTxPower(4);
-    // Set the BLE device name
-    Bluefruit.setName("Faketec_OTA");
+  Bluefruit.begin(1, 0);
+  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
+  Bluefruit.setTxPower(4);
+  // Set the BLE device name
+  Bluefruit.setName("Faketec_OTA");
 
-    Bluefruit.Periph.setConnectCallback(connect_callback);
-    Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
+  Bluefruit.Periph.setConnectCallback(connect_callback);
+  Bluefruit.Periph.setDisconnectCallback(disconnect_callback);
 
-    // To be consistent OTA DFU should be added first if it exists
-    bledfu.begin();
+  // To be consistent OTA DFU should be added first if it exists
+  bledfu.begin();
 
-    // Set up and start advertising
-    // Advertising packet
-    Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
-    Bluefruit.Advertising.addTxPower();
-    Bluefruit.Advertising.addName();
+  // Set up and start advertising
+  // Advertising packet
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addName();
 
-    /* Start Advertising
-     - Enable auto advertising if disconnected
-     - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
-     - Timeout for fast mode is 30 seconds
-     - Start(timeout) with timeout = 0 will advertise forever (until connected)
+  /* Start Advertising
+    - Enable auto advertising if disconnected
+    - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+    - Timeout for fast mode is 30 seconds
+    - Start(timeout) with timeout = 0 will advertise forever (until connected)
 
-     For recommended advertising interval
-     https://developer.apple.com/library/content/qa/qa1931/_index.html
-    */
-    Bluefruit.Advertising.restartOnDisconnect(true);
-    Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
-    Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
-    Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
+    For recommended advertising interval
+    https://developer.apple.com/library/content/qa/qa1931/_index.html
+  */
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
+  Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds
 
   return true;
 }
diff --git a/src/helpers/nrf52/faketecBoard.h b/src/helpers/nrf52/faketecBoard.h
index b5cebb78..676bc455 100644
--- a/src/helpers/nrf52/faketecBoard.h
+++ b/src/helpers/nrf52/faketecBoard.h
@@ -31,11 +31,11 @@ public:
 
     pinMode(PIN_VBAT_READ, INPUT);
 
-    #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
-      Wire.begin(PIN_BOARD_SDA, PIN_BOARD_SCL);
-    #else
-      Wire.begin();
-    #endif
+#if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
+    Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL)
+#endif
+
+    Wire.begin();
 
     pinMode(SX126X_POWER_EN, OUTPUT);
     digitalWrite(SX126X_POWER_EN, HIGH);
diff --git a/src/helpers/ui/SSD1306Display.cpp b/src/helpers/ui/SSD1306Display.cpp
index fe5be0ca..4c2699ac 100644
--- a/src/helpers/ui/SSD1306Display.cpp
+++ b/src/helpers/ui/SSD1306Display.cpp
@@ -1,7 +1,13 @@
 #include "SSD1306Display.h"
 
+bool SSD1306Display::i2c_probe(TwoWire& wire, uint8_t addr) {
+  wire.beginTransmission(addr);
+  uint8_t error = wire.endTransmission();
+  return (error == 0);
+}
+
 bool SSD1306Display::begin() {
-  return display.begin(SSD1306_SWITCHCAPVCC, DISPLAY_ADDRESS, true, false);
+  return display.begin(SSD1306_SWITCHCAPVCC, DISPLAY_ADDRESS, true, false) && i2c_probe(Wire, DISPLAY_ADDRESS);
 }
 
 void SSD1306Display::turnOn() {
diff --git a/src/helpers/ui/SSD1306Display.h b/src/helpers/ui/SSD1306Display.h
index a685eedf..c90a336d 100644
--- a/src/helpers/ui/SSD1306Display.h
+++ b/src/helpers/ui/SSD1306Display.h
@@ -3,6 +3,7 @@
 #include "DisplayDriver.h"
 #include <Wire.h>
 #include <Adafruit_GFX.h>
+#define SSD1306_NO_SPLASH
 #include <Adafruit_SSD1306.h>
 
 #ifndef PIN_OLED_RESET
@@ -18,6 +19,7 @@ class SSD1306Display : public DisplayDriver {
   bool _isOn;
   uint8_t _color;
 
+  bool i2c_probe(TwoWire& wire, uint8_t addr);
 public:
   SSD1306Display() : DisplayDriver(128, 64), display(128, 64, &Wire, PIN_OLED_RESET) { _isOn = false; }
   bool begin();