diff --git a/src/interface.jl b/src/interface.jl
index d9cce19..e2b648a 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -145,7 +145,7 @@ function decisionMaker(a::T1, state::T2)::String where {T1<:agent, T2<:AbstractD
   prompt =  formatLLMtext_llama3instruct("system", _prompt)
 
   msgMeta = GeneralUtils.generate_msgMeta(
-    a.config[:externalService][:text2textinstruct],
+    a.config[:externalService][:text2textinstruct][:mqtttopic],
     senderName= "decisionMaker",
     senderId= a.id,
     receiverName= "text2textinstruct",
diff --git a/src/llmfunction.jl b/src/llmfunction.jl
index ee30e5c..03baaa6 100644
--- a/src/llmfunction.jl
+++ b/src/llmfunction.jl
@@ -21,12 +21,15 @@ julia>
 
 # TODO
   - [] update docstring
-  - [] implement the function
+  - [WORKING] implement the function
 
 # Signature
 """
-function chatbox(input::T) where {T<:AbstractString}
+function chatbox(a::T1, input::T2) where {T1<:agent, T2<:AbstractString}
+  error("--> chatbox")
   # put in model format
+  if a.config[:externalService][]
+  GeneralUtils.formatLLMtext_llama3instruct
 end
 
 """ Search wine in stock.
diff --git a/src/mcts.jl b/src/mcts.jl
index b4e568f..013de73 100644
--- a/src/mcts.jl
+++ b/src/mcts.jl
@@ -232,18 +232,20 @@ julia>
 """
 function transition(a::T1, state::T2, action::T3, 
           actioninput::T3) where {T1<:agent, T2<:AbstractDict, T3<:AbstractString}
-error("--> transition")
+
 
   # map action and input() to llm function
-  # result =
-  # if action == "chatbox"
-  #   chatbox(input)
-  # elseif 
+  result =
+  if action == "chatbox"
+    chatbox(a, input)
+  elseif action == "winestock"
 
-  # else
+  elseif action == "finish"
 
-  # end
+  else
 
+  end
+  error("--> transition")
   
 end
 
diff --git a/test/runtest.jl b/test/runtest.jl
index d425e83..9928e9e 100644
--- a/test/runtest.jl
+++ b/test/runtest.jl
@@ -8,30 +8,24 @@ config = copy(JSON3.read("config.json"))
 
 instanceInternalTopic = config[:serviceInternalTopic][:mqtttopic] * "/1" 
 
-client, connection = MakeConnection(config[:mqttServerInfo][:value][:broker], 
-                                    config[:mqttServerInfo][:value][:port])
+client, connection = MakeConnection(config[:mqttServerInfo][:broker], 
+                                    config[:mqttServerInfo][:port])
 
 receiveUserMsgChannel = Channel{Dict}(4)
 receiveInternalMsgChannel = Channel{Dict}(4)
 
 msgMeta = GeneralUtils.generate_msgMeta(
   "N/A", 
-  replyTopic = config[:servicetopic][:value]  # ask frontend reply to this instance_chat_topic
+  replyTopic = config[:servicetopic][:mqtttopic]  # ask frontend reply to this instance_chat_topic
   )  
 
 agentConfig = Dict(
-  :mqttServerInfo=> Dict(
-    :broker=> config[:mqttServerInfo][:value][:broker],
-    :port=> config[:mqttServerInfo][:value][:port],
-  ),
+  :mqttServerInfo=> config[:mqttServerInfo],
   :receivemsg=>  Dict(
-    :prompt=> config[:servicetopic][:value], # topic to receive prompt i.e. frontend send msg to this topic
+    :prompt=> config[:servicetopic][:mqtttopic], # topic to receive prompt i.e. frontend send msg to this topic
     :internal=> instanceInternalTopic,
   ),
-  :externalService=> Dict(
-    :text2textinstruct=> config[:externalService][:text2textinstruct][:value],
-    :text2textchat=> config[:externalService][:text2textchat][:value],
-  ),
+  :externalService=> config[:externalService],
 )
 
 # Instantiate an agent