Add two solutions to param updates

app/src/ble.c

@@ -76,10 +76,39 @@ static void security_changed(struct bt_conn *conn, bt_security_t level,
     }
 }
 
+static bool le_param_req(struct bt_conn *conn, struct bt_le_conn_param *param) {
+    static struct bt_conn_info info;
+
+    bt_conn_get_info(conn, &info);
+
+    if (info.role == BT_CONN_ROLE_MASTER && (param->interval_min != 6 || param->latency != 30)) {
+        return false;
+    }
+
+    return true;
+}
+
+static void le_param_updated(struct bt_conn *conn, u16_t interval,
+				 u16_t latency, u16_t timeout) {
+    static struct bt_conn_info info;
+
+    bt_conn_get_info(conn, &info);
+
+    if (info.role == BT_CONN_ROLE_MASTER && (interval != 6 || latency != 30)) {
+        bt_conn_le_param_update(conn, BT_LE_CONN_PARAM(0x0006, 0x0006, 30, 400));
+    }
+
+    LOG_DBG("Params updated: Interval: %d, Latency: %d", interval, latency);
+};
+
 static struct bt_conn_cb conn_callbacks = {
     .connected = connected,
     .disconnected = disconnected,
     .security_changed = security_changed,
+#if !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
+    .le_param_req = le_param_req,
+    .le_param_updated = le_param_updated,
+#endif
 };
 
 static void auth_passkey_display(struct bt_conn *conn, unsigned int passkey)

app/src/split/bluetooth/central.c

@@ -67,13 +67,6 @@ static u8_t split_central_notify_func(struct bt_conn *conn,
 		}
 	}
 
-	bt_conn_le_param_update(conn, BT_LE_CONN_PARAM(0x0006, 0x0006, 30, 400));
-
-	struct bt_conn_info info;
-
-	bt_conn_get_info(conn, &info);
-
-	LOG_DBG("Interval: %d, Latency: %d, PHY: %d", info.le.interval, info.le.latency, info.le.phy->rx_phy);
 
 	return BT_GATT_ITER_CONTINUE;
 }