diff --git a/src/NATSBridge.jl b/src/NATSBridge.jl
index 03044fe..eda6441 100644
--- a/src/NATSBridge.jl
+++ b/src/NATSBridge.jl
@@ -431,7 +431,8 @@ function smartsend(
   receiver_id::String = "",
   reply_to::String = "",
   reply_to_msg_id::String = "",
-  is_publish::Bool = true   # some time the user want to get env and env_json_str from this function without publishing the msg
+  is_publish::Bool = true,   # some time the user want to get env and env_json_str from this function without publishing the msg
+  NATS_connection::Union{NATS.Connection, Nothing} = nothing  # a provided connection saves establishing connection overhead.
 ) where {T1<:Any}
 
   # Generate correlation ID if not provided
@@ -515,8 +516,12 @@ function smartsend(
   )
   
   env_json_str = envelope_to_json(env)  # Convert envelope to JSON
-  if is_publish
+  if is_publish == false
+    # skip publish a message
+  elseif is_publish == true && NATS_connection === nothing
     publish_message(broker_url, subject, env_json_str, cid)  # Publish message to NATS
+  elseif is_publish == true && NATS_connection !== nothing
+    publish_message(NATS_connection, subject, env_json_str, cid)  # Publish message to NATS
   end
   
   return (env, env_json_str)
@@ -673,6 +678,10 @@ connection management and logging.
 """
 function publish_message(broker_url::String, subject::String, message::String, correlation_id::String)
   conn = NATS.connect(broker_url)  # Create NATS connection
+  publish_message(conn, subject, message, correlation_id)
+end
+
+function publish_message(conn::NATS.Connection, subject::String, message::String, correlation_id::String)
   try
     NATS.publish(conn, subject, message)  # Publish message to NATS
     log_trace(correlation_id, "Message published to $subject")  # Log successful publish
@@ -1055,7 +1064,7 @@ function plik_oneshot_upload(file_server_url::String, filepath::String)
 end
 
 function _get_payload_bytes(data)
-  @error "didn't implement yet"
+  @error "Didn't implement yet. The developer will implement this function later."
 end