diff --git a/libraries/includes/defines.h b/libraries/includes/defines.h
index 3610300..cb1a040 100644
--- a/libraries/includes/defines.h
+++ b/libraries/includes/defines.h
@@ -10,7 +10,7 @@
 #define LED_RED 3
 #define LED_GREEN 2
 #define LED_BLUE 45
-
+#define CONFIG_SWITCH 46
 
 
 
diff --git a/sketch/configuration.cpp b/sketch/configuration.cpp
index b4a79fc..56d99cc 100644
--- a/sketch/configuration.cpp
+++ b/sketch/configuration.cpp
@@ -26,8 +26,8 @@ const uint32_t MAGIC = 0xaffe0001;
 
 config_t myConfig = { 
     .magic = MAGIC,
-    .appEui = { 0, 0, 0, 0, 0, 0, 0, 0 },
-    .appKey = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+    .appEui = { 0xa0, 0x57, 0x81, 0x00, 0x01, 0x12, 0xaa, 0xf3 },
+    .appKey = { 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88 },
     .modbus_poll_slots = {
         { .typ = INPUT_REGISTERS, .id = 7, .address = 0x01 },
         { .typ = INPUT_REGISTERS, .id = 7, .address = 0x02 },
diff --git a/sketch/sketch.ino b/sketch/sketch.ino
index e499a20..ecdde8d 100644
--- a/sketch/sketch.ino
+++ b/sketch/sketch.ino
@@ -18,10 +18,13 @@ void setup() {
   pinMode(LED_GREEN, OUTPUT);
   digitalWrite(LED_GREEN, LOW);
 
+  pinMode(CONFIG_SWITCH, INPUT_PULLUP);
+
   Serial.begin(115200);
 
   configLoad();
 
+  productionMode = (digitalRead(CONFIG_SWITCH) == HIGH);
   if (productionMode) {
     productionSetup();
   } else {
diff --git a/snippets/form_table_config_approach.txt b/snippets/form_table_config_approach.txt
index c29b910..06ecabb 100644
--- a/snippets/form_table_config_approach.txt
+++ b/snippets/form_table_config_approach.txt
@@ -34,3 +34,24 @@
         buffer << std::uppercase << std::setfill('0') << std::setw(2) << std::hex << (int)myConfig.appKey[i];
     }
     buffer << "\">";
+
+
+
+
+
+static void handleConfigSave() {
+    char *arg1 = (char*)server.arg("AppEui").c_str();
+    Serial.printf("AppEui: %s\n\r", arg1);
+    parseField(arg1, 1, 8, myConfig.appEui);
+
+    if (!configParsingFailed) {
+        char *arg2 = (char*)server.arg("AppKey").c_str();
+        Serial.printf("AppKey: %s\n\r", arg2);
+        parseField(arg2, 2, 16, myConfig.appKey);
+    }
+
+    configSaved = !configParsingFailed;
+    server.sendHeader("Location", String("/"), true);
+    server.send(302, "text/plain", "");
+}
+