diff --git a/esp32_device/.vscode/settings.json b/esp32_device/.vscode/settings.json
index 7b9add5..2669f47 100644
--- a/esp32_device/.vscode/settings.json
+++ b/esp32_device/.vscode/settings.json
@@ -46,6 +46,7 @@
     "string_view": "c",
     "format": "c",
     "span": "c",
-    "regex": "c"
+    "regex": "c",
+    "stdlib.h": "c"
   }
 }
diff --git a/esp32_device/main/CMakeLists.txt b/esp32_device/main/CMakeLists.txt
index 82ce304..f7bdb83 100755
--- a/esp32_device/main/CMakeLists.txt
+++ b/esp32_device/main/CMakeLists.txt
@@ -1,4 +1,4 @@
-idf_component_register(SRCS "secure_api.c" "http_client.c" "ethernet.c" "unsecure_api.c" "system.c" "crypto.c" "random.c" "storage.c" "main.c"
+idf_component_register(SRCS "jwt.c" "secure_api.c" "http_client.c" "ethernet.c" "unsecure_api.c" "system.c" "crypto.c" "random.c" "storage.c" "main.c"
                         "dev_name.c"
                     INCLUDE_DIRS ".")
 
diff --git a/esp32_device/main/jwt.c b/esp32_device/main/jwt.c
new file mode 100644
index 0000000..288fccc
--- /dev/null
+++ b/esp32_device/main/jwt.c
@@ -0,0 +1,9 @@
+
+#include <string.h>
+
+#include "jwt.h"
+
+char *jwt_gen(cJSON *payload)
+{
+    return strdup("TODO:)");
+}
\ No newline at end of file
diff --git a/esp32_device/main/jwt.h b/esp32_device/main/jwt.h
new file mode 100644
index 0000000..16e75d3
--- /dev/null
+++ b/esp32_device/main/jwt.h
@@ -0,0 +1,24 @@
+/**
+ * JWT utilities
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include "cJSON.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /**
+     * Sign JWT token
+     *
+     * Return encoded JWT or NULL in case of failure
+     */
+    char *jwt_gen(cJSON *payload);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/esp32_device/main/secure_api.c b/esp32_device/main/secure_api.c
index 7200cc7..5f1e0a7 100644
--- a/esp32_device/main/secure_api.c
+++ b/esp32_device/main/secure_api.c
@@ -10,6 +10,7 @@
 #include "dev_name.h"
 #include "storage.h"
 #include "http_client.h"
+#include "jwt.h"
 
 #include "esp_log.h"
 
@@ -196,6 +197,27 @@ char *secure_api_get_dev_certificate()
 
 void *secure_api_sync_device()
 {
+    cJSON *obj = cJSON_CreateObject();
+    if (!obj)
+    {
+        ESP_LOGE(TAG, "Failed allocate memory to store JSON object!");
+        return NULL;
+    }
+
+    cJSON_AddItemToObject(obj, "info", genDevInfo());
+
+    char *encoded_req = jwt_gen(obj);
+    cJSON_Delete(obj);
+
+    if (!encoded_req)
+    {
+        ESP_LOGE(TAG, "Failed to encode JWT!");
+        return NULL;
+    }
+
+    printf("JWT: %s\n", encoded_req);
+    free(encoded_req);
+
     printf("here implement sync device logic\n");
     return NULL;
 }
\ No newline at end of file