call ble_gatts_chr_updated() on battery level change

This call doesn't require the connection handle, and thus doesn't
need an additional setup call to pass in that value.  Remove the
code that was intended to be called from on_connect.

nimble/host/services/bas/include/services/bas/ble_svc_bas.h

@@ -26,11 +26,6 @@
 /* 16 Bit Battery Service Characteristic UUIDs */
 #define BLE_SVC_BAS_CHR_UUID16_BATTERY_LEVEL                 0x2A19
 
-void ble_svc_bas_on_gap_connect(uint16_t conn_handle);
-
-void ble_svc_bas_init(void);
-
 int ble_svc_bas_battery_level_set(uint8_t level);
 
 #endif
-

nimble/host/services/bas/src/ble_svc_bas.c

@@ -31,14 +31,6 @@
 static uint16_t ble_svc_bas_battery_handle;
 #endif
 
-/* Connection handle 
- *
- * TODO: In order to support multiple connections we would need to save
- *       the handles for every connection, not just the most recent. Then
- *       we would need to notify each connection when needed.
- * */
-static uint16_t ble_svc_bas_conn_handle;
-
 /* Battery level */
 uint8_t ble_svc_bas_battery_level;
 
@@ -84,7 +76,7 @@ ble_svc_bas_access(uint16_t conn_handle, uint16_t attr_handle,
 {
     uint16_t uuid16 = ble_uuid_u16(ctxt->chr->uuid);
     int rc;
-    
+
     switch (uuid16) {
     case BLE_SVC_BAS_CHR_UUID16_BATTERY_LEVEL:
         assert(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR);
@@ -98,19 +90,6 @@ ble_svc_bas_access(uint16_t conn_handle, uint16_t attr_handle,
     }
 }
 
-/**
- * This function must be called with the connection handle when a gap 
- * connect event is received in order to send notifications to the
- * client.
- *
- * @params conn_handle          The connection handle for the current
- *                                  connection.
- */
-void 
-ble_svc_bas_on_gap_connect(uint16_t conn_handle) 
-{
-    ble_svc_bas_conn_handle = conn_handle;
-}
 
 /**
  * Set the battery level, must be between 0 and 100.
@@ -118,17 +97,15 @@ ble_svc_bas_on_gap_connect(uint16_t conn_handle)
  */
 int
 ble_svc_bas_battery_level_set(uint8_t level) {
-    int rc = 0;
     if (level > 100)
 	level = 100;
     if (ble_svc_bas_battery_level != level) {
 	ble_svc_bas_battery_level = level;
 #if MYNEWT_VAL(BLE_SVC_BAS_BATTERY_LEVEL_NOTIFY_ENABLE) > 0
-	rc = ble_gattc_notify(ble_svc_bas_conn_handle,
-			      ble_svc_bas_battery_handle);
+        ble_gatts_chr_updated(ble_svc_bas_battery_handle);
 #endif
     }
-    return rc;
+    return 0;
 }
 
 /**