diff --git a/lambda/config_handler/__init__.py b/lambda/config_handler/__init__.py
index 5ed71a3..df76891 100644
--- a/lambda/config_handler/__init__.py
+++ b/lambda/config_handler/__init__.py
@@ -2,6 +2,7 @@ import os
 import boto3
 import json
 import functools
+import logging
 
 @functools.lru_cache()
 def get(topic: str, parameter: str, default=None) -> str:
@@ -26,6 +27,8 @@ def get(topic: str, parameter: str, default=None) -> str:
     try:
         secret_data = json.loads(sm.get_secret_value(SecretId=topic)['SecretString'])
         return secret_data[parameter]
+    except sm.exceptions.ClientError as error:
+        logging.warning(f"Error trying to use secret manager for {topic} {parameter} : {error}")
     except (KeyError, sm.exceptions.ResourceNotFoundException):
         pass
     except:
diff --git a/lambda/station_api_to_iot_core/__init__.py b/lambda/station_api_to_iot_core/__init__.py
index afc720a..31b780f 100644
--- a/lambda/station_api_to_iot_core/__init__.py
+++ b/lambda/station_api_to_iot_core/__init__.py
@@ -10,7 +10,7 @@ from io import BytesIO
 import boto3
 import config_handler
 
-CALLSIGN_BLOCK_LIST = ["CHANGEME_RDZTTGO"]
+CALLSIGN_BLOCK_LIST = ["CHANGEME_RDZTTGO", "14FRS119_LE JUDA"]
 
 import es
 
@@ -56,7 +56,7 @@ def lambda_handler(event, context):
         payload = json.loads(event["body"])
     except:
         return {"statusCode": 400, "body": "JSON decode issue"}
-    print(payload)
+    print(json.dumps(event))
     if "user-agent" in event["headers"]:
         event["time_server"] = datetime.datetime.now().isoformat()
         payload["user-agent"] = event["headers"]["user-agent"]
diff --git a/lambda/station_api_to_iot_core/__main__.py b/lambda/station_api_to_iot_core/__main__.py
index d5097f5..655f0f0 100644
--- a/lambda/station_api_to_iot_core/__main__.py
+++ b/lambda/station_api_to_iot_core/__main__.py
@@ -1,4 +1,10 @@
-from . import *
+import unittest
+import station_api_to_iot_core
+from unittest.mock import MagicMock, call, patch
+import datetime
+import copy
+import json
+
 payload = {
     "version": "2.0",
     "routeKey": "PUT /sondes/telemetry",
@@ -36,8 +42,35 @@ payload = {
         "timeEpoch": 1612051825409,
     },
     "body": """
-    {"software_name": "radiosonde_auto_rx", "software_version": "1.5.8-beta2", "uploader_callsign": "CHANGEME_RDZTTGO", "uploader_position": [null,null,null], "uploader_antenna": "Dipole", "uploader_contact_email": "none@none.com", "mobile": false}
+    {"software_name": "radiosonde_auto_rx", "software_version": "1.5.8-beta2", "uploader_callsign": "A", "uploader_position": [null,null,null], "uploader_antenna": "Dipole", "uploader_contact_email": "none@none.com", "mobile": false}
     """,
     "isBase64Encoded": False,
 }
-print(lambda_handler(payload, {}))
\ No newline at end of file
+
+class TestStation(unittest.TestCase):
+    def setUp(self):
+        station_api_to_iot_core.es.request = MagicMock()
+        station_api_to_iot_core.sns.publish = MagicMock()
+    
+    @patch('builtins.print')
+    def test_blocked_call(self, mocked_print):
+        blocked_call_payload = copy.deepcopy(payload)
+        body = json.loads(blocked_call_payload["body"])
+        body["uploader_callsign"] = "CHANGEME_RDZTTGO"
+        blocked_call_payload["body"] = json.dumps(body)
+        station_api_to_iot_core.lambda_handler(blocked_call_payload,{})
+        station_api_to_iot_core.es.request.assert_not_called()
+        station_api_to_iot_core.sns.publish.assert_not_called()
+        mocked_print.assert_called()
+        json.loads(mocked_print.call_args.args[0])
+
+    @patch('builtins.print')
+    def test_call(self, mocked_print):
+        blocked_call_payload = copy.deepcopy(payload)
+        body = json.loads(blocked_call_payload["body"])
+        blocked_call_payload["body"] = json.dumps(body)
+        station_api_to_iot_core.lambda_handler(blocked_call_payload,{})
+        station_api_to_iot_core.es.request.assert_called()
+        station_api_to_iot_core.sns.publish.assert_called()
+if __name__ == '__main__':
+    unittest.main()