diff --git a/btle/custom/custom_helper.cpp b/btle/custom/custom_helper.cpp
index ea8d98e..5259a7a 100644
--- a/btle/custom/custom_helper.cpp
+++ b/btle/custom/custom_helper.cpp
@@ -189,6 +189,7 @@ error_t custom_add_in_characteristic(uint16_t    service_handle,
                                      uint8_t    *p_data,
                                      uint16_t    min_length,
                                      uint16_t    max_length,
+                                     bool        writeAuthorization,
                                      ble_gatts_char_handles_t *p_char_handle)
 {
     /* Characteristic metadata */
@@ -212,7 +213,7 @@ error_t custom_add_in_characteristic(uint16_t    service_handle,
         (char_props.notify || char_props.indicate) ? &cccd_md : NULL;
 
     /* Attribute declaration */
-    ble_gatts_attr_md_t attr_md = {0};
+    ble_gatts_attr_md_t attr_md = {.wr_auth = writeAuthorization};
 
     attr_md.vloc = BLE_GATTS_VLOC_STACK;
     attr_md.vlen = (min_length == max_length) ? 0 : 1;
diff --git a/btle/custom/custom_helper.h b/btle/custom/custom_helper.h
index d4fa3cc..4742e66 100644
--- a/btle/custom/custom_helper.h
+++ b/btle/custom/custom_helper.h
@@ -36,6 +36,7 @@ error_t custom_add_in_characteristic(uint16_t                  service_handle,
                                      uint8_t                  *p_data,
                                      uint16_t                  min_length,
                                      uint16_t                  max_length,
+                                     bool                      writeAuthorization,
                                      ble_gatts_char_handles_t *p_char_handle);
 
 error_t custom_add_in_descriptor(uint16_t                      char_handle,
diff --git a/nRF51GattServer.cpp b/nRF51GattServer.cpp
index aa38d06..79c0d72 100644
--- a/nRF51GattServer.cpp
+++ b/nRF51GattServer.cpp
@@ -76,6 +76,7 @@ ble_error_t nRF51GattServer::addService(GattService &service)
                                               p_char->getValueAttribute().getValuePtr(),
                                               p_char->getValueAttribute().getInitialLength(),
                                               p_char->getValueAttribute().getMaxLength(),
+                                              p_char->isWriteAuthorizationEnabled(),
                                               &nrfCharacteristicHandles[characteristicCount]),
                  BLE_ERROR_PARAM_OUT_OF_RANGE );
 
@@ -274,6 +275,14 @@ void nRF51GattServer::hwCallback(ble_evt_t *p_ble_evt)
             sd_ble_gatts_sys_attr_set(gattsEventP->conn_handle, NULL, 0);
             return;
 
+        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
+            if (gattsEventP->params.authorize_request.type != BLE_GATTS_AUTHORIZE_TYPE_WRITE) {
+                return; /* we don't handle anything other than write authorization at the moment */
+            }
+            eventType    = GattServerEvents::GATT_EVENT_WRITE_AUTHORIZATION_REQ;
+            handle_value = gattsEventP->params.authorize_request.request.write.handle;
+            break;
+
         default:
             return;
     }
@@ -293,6 +302,25 @@ void nRF51GattServer::hwCallback(ble_evt_t *p_ble_evt)
                     handleDataWrittenEvent(&cbParams);
                     break;
                 }
+                case GattServerEvents::GATT_EVENT_WRITE_AUTHORIZATION_REQ: {
+                    GattCharacteristicWriteAuthCBParams cbParams = {
+                        .charHandle = i,
+                        .offset     = gattsEventP->params.authorize_request.request.write.offset,
+                        .len        = gattsEventP->params.authorize_request.request.write.len,
+                        .data       = gattsEventP->params.authorize_request.request.write.data,
+                    };
+                    ble_gatts_rw_authorize_reply_params_t reply = {
+                        .type = BLE_GATTS_AUTHORIZE_TYPE_WRITE,
+                        .params {
+                            .write = {
+                                .gatt_status = (p_characteristics[i]->authorizeWrite(&cbParams) ?
+                                                    BLE_GATT_STATUS_SUCCESS : BLE_GATT_STATUS_ATTERR_WRITE_NOT_PERMITTED)
+                            }
+                        }
+                    };
+                    sd_ble_gatts_rw_authorize_reply(gattsEventP->conn_handle, &reply);
+                    break;
+                }
                 default:
                     handleEvent(eventType, i);
                     break;