Add BT icon on the OLED status bar

main/disp_oled.cpp

@@ -517,7 +517,7 @@ void OLED_DrawBattery(u8g2_t *OLED, GPS_Position *GPS) // draw battery status pa
 #endif
 }
 
-void OLED_DrawStatusBar(u8g2_t *OLED, GPS_Position *GPS)
+void OLED_DrawStatusBar(u8g2_t *OLED, GPS_Position *GPS)   // status bar on top of the OLED
 { static bool Odd=0;
 #ifdef WITH_MAVLINK
   uint8_t Cap = MAVLINK_BattCap;                           // [%]
@@ -546,7 +546,12 @@ void OLED_DrawStatusBar(u8g2_t *OLED, GPS_Position *GPS)
 #ifdef WITH_SD
   if(SD_isMounted())
   { u8g2_SetFont(OLED, u8g2_font_twelvedings_t_all);
-    u8g2_DrawGlyph(OLED, 30, 12, 0x73); }
+    u8g2_DrawGlyph(OLED, 24, 12, 0x73); }
+#endif
+#ifdef WITH_BT_SPP
+  if(BT_SPP_isConnected())
+  { u8g2_SetFont(OLED, u8g2_font_open_iconic_embedded_1x_t);
+    u8g2_DrawGlyph(OLED, 36, 11, 0x4A); }
 #endif
   // u8g2_SetFont(OLED, u8g2_font_5x7_tr);
   // u8g2_SetFont(OLED, u8g2_font_5x8_tr);

main/hal.cpp

@@ -590,6 +590,8 @@ static uint32_t        BT_SPP_TxCong = 0;     // congestion control
 
 // static const char *BT_SPP_Welcome = "ESP32 OGN-Tracker\n";
 
+bool BT_SPP_isConnected(void) { return BT_SPP_Conn; }             // is a client conencted to BT_SPP ?
+
 static void setPilotID(esp_bd_addr_t MAC, size_t Len=6)           // set PilotID in the parameters from the BT SPP client MAC (thus Pilot's smartphone)
 { char *ID = Parameters.PilotID;
   ID[0]='B'; ID[1]='T'; ID[2]='_'; ID+=3;
@@ -626,7 +628,7 @@ static void esp_spp_cb(esp_spp_cb_event_t Event, esp_spp_cb_param_t *Param)
       BT_SPP_TxFIFO.Clear();                                      // clear the TxFIFO
       BT_SPP_Conn = Param->srv_open.handle;                       // store handle for esp_spp_write()
       BT_SPP_TxCong = 0;                                          // assume no congestion
-      setPilotID(Param->srv_open.rem_bda, sizeof(esp_bd_addr_t)); // PilotID is not taken from the connected BT client
+      setPilotID(Param->srv_open.rem_bda, sizeof(esp_bd_addr_t)); // PilotID is now taken from the connected BT client
       // memcpy(BT_SPP_MAC, Param->srv_open.rem_bda, sizeof(esp_bd_addr_t));
       // esp_spp_write(Param->srv_open.handle, BT_SPP_Wait, (uint8_t *)BT_SPP_Welcome); // write Welcome message to the BT_SPP
 #ifdef DEBUG_PRINT

main/hal.h

@@ -168,6 +168,7 @@ int  NVS_Init(void);                     // initialize non-volatile-storage in t
 
 #ifdef WITH_BT_SPP
 int  BT_SPP_Init(void);
+bool BT_SPP_isConnected(void);
 #endif
 
 #ifdef WITH_SPIFFS