Added bugfix to enable connection subrating

nimble/host/src/ble_gap.c

@@ -2304,6 +2304,9 @@ void
 ble_gap_rx_subrate_change(const struct ble_hci_ev_le_subev_subrate_change *ev)
 {
     struct ble_gap_event event;
+    uint16_t conn_handle;
+
+    conn_handle = le16toh(ev->conn_handle);
 
     memset(&event, 0x0, sizeof event);
 
@@ -2316,6 +2319,7 @@ ble_gap_rx_subrate_change(const struct ble_hci_ev_le_subev_subrate_change *ev)
     event.subrate_change.supervision_tmo = le16toh(ev->supervision_tmo);
 
     ble_gap_event_listener_call(&event);
+    ble_gap_call_conn_event_cb(&event, conn_handle);
 }
 #endif
 

nimble/host/src/ble_hs_startup.c

@@ -267,6 +267,7 @@ ble_hs_startup_le_set_evmask_tx(void)
          * 0x0000000400000000 LE Subrate change event
          */
         mask |= 0x0000000400000000;
+    }
 #endif
 
 #if MYNEWT_VAL(BLE_POWER_CONTROL)

nimble/include/nimble/hci_common.h

@@ -1232,6 +1232,7 @@ struct ble_hci_le_subrate_req_cp {
     uint16_t conn_handle;
     uint16_t subrate_min;
     uint16_t subrate_max;
+    uint16_t max_latency;
     uint16_t cont_num;
     uint16_t supervision_tmo;
 } __attribute__((packed));