Bluetooth: ATT: Add ATT first/last handle defines

Adds #defines for the minimum (first) and maximum (last)
attribute handles in ATT. These are useful for when setting e.g.
the start and end handle when doing a full GATT discover.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

include/bluetooth/att.h

@@ -47,6 +47,11 @@ extern "C" {
 /* Version 5.2, Vol 3, Part F, 3.2.9 defines maximum attribute length to 512 */
 #define BT_ATT_MAX_ATTRIBUTE_LEN		512
 
+/* Handle 0x0000 is reserved for future use */
+#define BT_ATT_FIRST_ATTTRIBUTE_HANDLE          0x0001
+/* 0xffff is defined as the maximum, and thus last, valid attribute handle */
+#define BT_ATT_LAST_ATTTRIBUTE_HANDLE           0xffff
+
 #ifdef __cplusplus
 }
 #endif