nrf_ble: Expose configuration of max number of characteristics and descriptors

Author: pi-anl

features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_NRF52/source/nRF5xGattServer.h

@@ -43,8 +43,8 @@ class nRF5xGattServer : public GattServer
 
 
 private:
-    const static unsigned BLE_TOTAL_CHARACTERISTICS = 20;
-    const static unsigned BLE_TOTAL_DESCRIPTORS     = 8;
+    const static unsigned BLE_TOTAL_CHARACTERISTICS = NRF_SDH_BLE_TOTAL_CHARACTERISTICS;
+    const static unsigned BLE_TOTAL_DESCRIPTORS     = NRF_SDH_BLE_TOTAL_DESCRIPTORS;
     const static unsigned TOTAL_CONCURRENT_LONG_WRITE_REQUESTS = 3;
 
 private:

features/FEATURE_BLE/targets/TARGET_NORDIC/mbed_lib.json

@@ -25,6 +25,16 @@
             "help": "select whether to include the Service Changed characteristic in the GATT Server",
             "value": "1",
             "macro_name": "NRF_SDH_BLE_SERVICE_CHANGED"
+        },
+        "max_characteristics": {
+            "help": "Sets the maximum number of characteristics that can be registered",
+            "value": "20",
+            "macro_name": "NRF_SDH_BLE_TOTAL_CHARACTERISTICS"
+        },
+        "max_descriptors": {
+            "help": "Sets the maximum number of descriptors that can be registered",
+            "value": "8",
+            "macro_name": "NRF_SDH_BLE_TOTAL_DESCRIPTORS"
         }
     }
 }