diff --git a/arduino_lib/sesami_util.h b/arduino_lib/sesami_util.h
index 320c846e..b7852e44 100644
--- a/arduino_lib/sesami_util.h
+++ b/arduino_lib/sesami_util.h
@@ -98,8 +98,6 @@ std::optional<String> operation_sesami(String device_uuid, String api_key, int c
 
     if (!http.begin(url))
     {
-        USBSerial.println("Connection failed.\nWaiting 5 seconds before retrying...\n");
-        delay(5000);
         return std::nullopt;
     }
 
@@ -112,13 +110,21 @@ std::optional<String> operation_sesami(String device_uuid, String api_key, int c
     http.addHeader("x-api-key", api_key);
     int responseCode = http.POST(body);
     String result_body = http.getString();
+    http.end();
     USBSerial.printf("** POST result **\n");
     USBSerial.printf("responseCode: %d\n", responseCode);
-    body.replace("\\\"", "\"");
-    USBSerial.println("body: " + result_body);
-    http.end();
+    USBSerial.println("result_body: " + result_body);
 
-    return result_body;
+    if (responseCode != 200)
+    {
+        return std::nullopt;
+    }
+    else
+    {
+        body.replace("\\\"", "\"");
+        USBSerial.println("body: " + result_body);
+        return result_body;
+    }
 }
 
 std::optional<String> get_sesami_status(String device_uuid, String api_key)
@@ -129,8 +135,6 @@ std::optional<String> get_sesami_status(String device_uuid, String api_key)
 
     if (!http.begin(url))
     {
-        USBSerial.println("Connection failed.\nWaiting 5 seconds before retrying...\n");
-        delay(5000);
         return std::nullopt;
     }
 
@@ -157,8 +161,6 @@ std::optional<String> get_sesami_history(String device_uuid, String api_key)
 
     if (!http.begin(url))
     {
-        USBSerial.println("Connection failed.\nWaiting 5 seconds before retrying...\n");
-        delay(5000);
         return std::nullopt;
     }
 
diff --git a/sketchbooks/m5atoms3_sesami_client/src/main.cpp b/sketchbooks/m5atoms3_sesami_client/src/main.cpp
index f16f80aa..d753d8a5 100644
--- a/sketchbooks/m5atoms3_sesami_client/src/main.cpp
+++ b/sketchbooks/m5atoms3_sesami_client/src/main.cpp
@@ -106,8 +106,18 @@ void loop()
       }
       if (ret)
       {
-        response_json["success"] = true;
-        response_json["message"] = command + " success";
+        DeserializationError error = deserializeJson(result_json, ret.value().c_str());
+        if (error)
+        {
+          response_json["success"] = false;
+          response_json["message"] = "deserializeJson() failed during operation_sesami: " + String(error.c_str()) + ", result: " + ret.value();
+        }
+        else
+        {
+          response_json["success"] = true;
+          response_json["message"] = command + " success";
+          response_json["result"] = result_json;
+        }
       }
       else
       {