chore(examples): enhance scan management

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

examples/Central/LedControl/LedControl.ino

@@ -42,7 +42,16 @@ void setup() {
   Serial.println("Bluetooth® Low Energy Central - LED control");
 
   // start scanning for peripherals
-  BLE.scanForUuid("19b10000-e8f2-537e-4f6c-d104768a1214");
+  int ret = 1;
+  do
+  {
+    ret = BLE.scanForUuid("19b10000-e8f2-537e-4f6c-d104768a1214");
+    if (ret == 0)
+    {
+      BLE.end();
+      BLE.begin();
+    }
+  } while(ret == 0);
 }
 
 void loop() {
@@ -64,12 +73,30 @@ void loop() {
     }
 
     // stop scanning
-    BLE.stopScan();
+    int ret = 1;
+    do
+    {
+      ret = BLE.stopScan();
+      if (ret == 0)
+      {
+        BLE.end();
+        BLE.begin();
+      }
+    } while(ret == 0);
 
     controlLed(peripheral);
 
     // peripheral disconnected, start scanning again
-    BLE.scanForUuid("19b10000-e8f2-537e-4f6c-d104768a1214");
+    ret = 1;
+    do
+    {
+      ret = BLE.scanForUuid("19b10000-e8f2-537e-4f6c-d104768a1214");
+      if (ret == 0)
+      {
+        BLE.end();
+        BLE.begin();
+      }
+    } while(ret == 0);
   }
 }
 

examples/Central/PeripheralExplorer/PeripheralExplorer.ino

@@ -29,7 +29,16 @@ void setup() {
   Serial.println("Bluetooth® Low Energy Central - Peripheral Explorer");
 
   // start scanning for peripherals
-  BLE.scan();
+  int ret = 1;
+  do
+  {
+    ret = BLE.scan();
+    if (ret == 0)
+    {
+      BLE.end();
+      BLE.begin();
+    }
+  } while(ret == 0);
 }
 
 void loop() {
@@ -49,7 +58,16 @@ void loop() {
     // see if peripheral is a LED
     if (peripheral.localName() == "LED") {
       // stop scanning
-      BLE.stopScan();
+      int ret = 1;
+      do
+      {
+        ret = BLE.stopScan();
+        if (ret == 0)
+        {
+          BLE.end();
+          BLE.begin();
+        }
+      } while(ret == 0);
 
       explorerPeripheral(peripheral);
 

examples/Central/Scan/Scan.ino

@@ -25,8 +25,17 @@ void setup() {
 
   Serial.println("Bluetooth® Low Energy Central scan");
 
-  // start scanning for peripheral
-  BLE.scan();
+  // start scanning for peripherals
+  int ret = 1;
+  do
+  {
+    ret = BLE.scan();
+    if (ret == 0)
+    {
+      BLE.end();
+      BLE.begin();
+    }
+  } while(ret == 0);
 }
 
 void loop() {

examples/Central/ScanCallback/ScanCallback.ino

@@ -31,7 +31,16 @@ void setup() {
   BLE.setEventHandler(BLEDiscovered, bleCentralDiscoverHandler);
 
   // start scanning for peripherals with duplicates
-  BLE.scan(true);
+  int ret = 1;
+  do
+  {
+    ret = BLE.scan(true);
+    if (ret == 0)
+    {
+      BLE.end();
+      BLE.begin();
+    }
+  } while(ret == 0);
 }
 
 void loop() {

examples/Central/SensorTagButton/SensorTagButton.ino

@@ -30,8 +30,17 @@ void setup() {
   Serial.println("Bluetooth® Low Energy Central - SensorTag button");
   Serial.println("Make sure to turn on the device.");
 
-  // start scanning for peripheral
-  BLE.scan();
+  // start scanning for peripherals
+  int ret = 1;
+  do
+  {
+    ret = BLE.scan();
+    if (ret == 0)
+    {
+      BLE.end();
+      BLE.begin();
+    }
+  } while(ret == 0);
 }
 
 void loop() {
@@ -52,12 +61,30 @@ void loop() {
     // "CC2650 SensorTag"
     if (peripheral.localName() == "CC2650 SensorTag") {
       // stop scanning
-      BLE.stopScan();
+      int ret = 1;
+      do
+      {
+        ret = BLE.stopScan();
+        if (ret == 0)
+        {
+          BLE.end();
+          BLE.begin();
+        }
+      } while(ret == 0);
 
       monitorSensorTagButtons(peripheral);
 
       // peripheral disconnected, start scanning again
-      BLE.scan();
+      ret = 1;
+      do
+      {
+        ret = BLE.scan();
+        if (ret == 0)
+        {
+          BLE.end();
+          BLE.begin();
+         }
+      } while(ret == 0);
     }
   }
 }