diff --git a/src/interface.jl b/src/interface.jl
index e3e2f55..68e2c10 100755
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -277,14 +277,14 @@ function identifyUserIntention(a::agent, usermsg::String)
   payloadChannel = Channel(1)
 
   # send prompt
-  CommUtils.request(a.mqttClient, msg, pubtopic=a.mqttClient.pubtopic.llmAIgpu)
+  CommUtils.request(a.mqttClient, msg, pubtopic=a.mqttClient.pubtopic.llmAI)
   starttime = Dates.now()
   timeout = 10
   result = nothing
 
   while true
     timepass = (Dates.now() - starttime).value / 1000.0
-    CommUtils.mqttRun(mqttclient, payloadChannel)
+    CommUtils.mqttRun(a.mqttClient, payloadChannel)#BUG no msg received
     if isready(payloadChannel)
       topic, payload = take!(payloadChannel)
       if payload[:msgMeta][:repondToMsgId] == msgPrompt[:msgMeta][:msgId]
@@ -300,9 +300,8 @@ function identifyUserIntention(a::agent, usermsg::String)
       error("undefined condition $(@__LINE__)")
     end
   end 
-
-  answer = getStringBetweenCharacters(result, "{", "}")
-
+  answer = result === nothing ? nothing : getStringBetweenCharacters(result, "{", "}")
+  @show answer
   return answer
 end