fix: configuration and cli arguments for examples

- Rename arguments for registration example from reg_folder to certDir.
- Change registration configuration key from deviceId to device_id.
- Update JSON encoding/decoding to use snake case keys for device configurations.

Author: yhseanhsu

etx/examples/node/src/0_registration_example.ts

@@ -63,7 +63,7 @@ async function main() {
         // 7. Prepare the "Frozen Bundle" (Identity Artifact)
         const frozenBundle = {
             registration: {
-                deviceId: regResp.deviceId,
+                device_id: regResp.deviceId,
                 certificate: {
                     // Convert Date back to string for JSON persistence
                     expiration_time: regResp.certificate.expirationTime.toISOString(),

etx/examples/node/src/1_deregistration_example.ts

@@ -34,7 +34,10 @@ async function main() {
         logger.setLevel(config.logLevel);
 
         // Extract device ID from the registration block
-        deviceId = artifact.registration.deviceId;
+        deviceId = artifact.registration.device_id;
+        if (!deviceId) {
+            throw new Error("Device ID is undefined.")
+        }
 
     } catch (error: any) {
         console.error(`CRITICAL: Failed to load device artifact: ${error.message}`);

etx/examples/python/src/examples/utils/config.py

@@ -122,7 +122,7 @@ def load_config(config_source: Union[str, Path], args: Optional[argparse.Namespa
             config.logLevel = args.loglevel.upper()
 
         if getattr(args, 'certDir', None):
-            config.certDir = args.reg_folder
+            config.certDir = args.certDir
 
         if getattr(args, "lat", None):
             config.identity.attributes.location.lat = args.lat