adding another error instance to blecommon.h

Author: Rohit Grover

common/blecommon.h

@@ -36,15 +36,10 @@ extern "C" {
 typedef enum ble_error_e
 {
     BLE_ERROR_NONE               = 0,       /**< No error */
-    BLE_ERROR_BUFFER_OVERFLOW    = 1,       /**< The requested action would
-                                             *cause a buffer overflow and has
-                                             *been aborted */
-    BLE_ERROR_NOT_IMPLEMENTED    = 2,       /**< Requested a feature that
-                                             *isn't yet implement or isn't
-                                             *supported by the target HW */
-    BLE_ERROR_PARAM_OUT_OF_RANGE = 3        /**< One of the supplied
-                                             *parameters is outside the valid
-                                             *range */
+    BLE_ERROR_BUFFER_OVERFLOW    = 1,       /**< The requested action would cause a buffer overflow and has been aborted */
+    BLE_ERROR_NOT_IMPLEMENTED    = 2,       /**< Requested a feature that isn't yet implement or isn't supported by the target HW */
+    BLE_ERROR_PARAM_OUT_OF_RANGE = 3,       /**< One of the supplied parameters is outside the valid range */
+    BLE_STACK_BUSY               = 4,       /**< The stack is busy */
 } ble_error_t;
 
 #ifdef __cplusplus