ENH: clean codes about device

JIRA: [STUDIO-13609]
Change-Id: I591de7033360b9570600006cfbce2148a8d031d5
(cherry picked from commit e9c774be8f4c89b8dafa14ef56913612fb68bd0c)

src/slic3r/GUI/DeviceCore/DevCtrl.cpp

@@ -0,0 +1,26 @@
+#include <nlohmann/json.hpp>
+#include "DevCtrl.h"
+
+// TODO: remove this include
+#include "DevUtil.h"
+#include "slic3r/GUI/DeviceManager.hpp"
+
+using namespace nlohmann;
+
+namespace Slic3r
+{
+    int DevCtrl::command_select_extruder(int id)
+    {
+        json j;
+        j["print"]["sequence_id"] = std::to_string(MachineObject::m_sequence_id++);
+        j["print"]["command"] = "select_extruder";
+        j["print"]["extruder_index"] = id;
+        int rtn = m_obj->publish_json(j, 1);
+        if (rtn == 0)
+        {
+            m_obj->targ_nozzle_id_from_pc = id;
+        }
+
+        return rtn;
+    }
+}