Facebook chat bot sending same message multiple times (Python) -

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i working on facebook mini-chat bot , encountering problem consists on bot receive same message on , on though has answered message.

it keeps receiving same text fb , replying on , over

def message_handler(request):     data = json.loads(request.body.decode('utf-8'))      if data , data['object'] == 'page':         pageentry in data['entry']:             print "nombre de message", len(pageentry['messaging'])             messagingevent in pageentry['messaging']:                  if messagingevent.get('optin'):                     print "optin", messagingevent                     receivedauthentication(messagingevent)                 elif messagingevent.get('message'):                     print "message", messagingevent                     receivedmessage(messagingevent)                 elif messagingevent.get('delivery'):                     print "delivery", messagingevent                     receiveddeliveryconfirmation(messagingevent)                 elif messagingevent.get('postback'):                     print "postback", messagingevent                     receivedpostback(messagingevent)                 else:                     print "unhandled"    return httpresponse(status=200)  def receivedmessage(event):    senderid = event.get('sender').get('id')    message = event.get('message')     messagetext = message.get('text')    messageattachments = message.get('attachments')     if messagetext:         if messagetext == 'image':             sendimagemessage(senderid)          elif messagetext == 'button':             sendbuttonmessage(senderid)          elif messagetext == 'generic':             sendgenericmessage(senderid)          elif messagetext == 'receipt':             sendreceiptmessage(senderid)         elif messagetext == 'hey':            sendtextmessage(senderid, "get it. gimme moment process :). in moment")            send_seen()            send_typing()            words = words_gen()            sendtextmessage(senderid, words)   def callsendapi(messagedata):     requests.post(            url='https://graph.facebook.com/v2.6/me/messages?access_token=' + config.page_token,           data=json.dumps(messagedata),         headers={"content-type":"application/json"}     )

i need send status 200 every time, did still receiving same text on , over

here events subscribed to

conversations, message_deliveries, message_reads, messages, messaging_optins, messaging_postbacks, picture

i removed messaging_echoes because thought problem turned out not

i have resolved issue writing function , checking duplicate messages in web api service.

here generating message unique id either payload or message received facebook user clicks or types , comparing earlier stored unique value concurrent dictionary.

_messageuniquekeysbysender concurrentdictionary , caching values sender id 30 minutes.

private bool isduplicate(messaging messaging)     {         var messageuniqueid = string.empty;         var messagemessaging = messaging messagemessaging;         if (messagemessaging != null)             messageuniqueid = messagemessaging.message.id + messagemessaging.message.sequencenumber;         else if (messaging postbackmessaging)             messageuniqueid = ((postbackmessaging)messaging).postback.payload +                               ((postbackmessaging)messaging).timestampunix;         if (string.isnullorempty(messageuniqueid)) return false;         string existinguniqueid;         if (_messageuniquekeysbysender.trygetvalue(messaging.sender.id, out existinguniqueid))         {             if (existinguniqueid == messageuniqueid)             {                 return true;             }             else             {                 _messageuniquekeysbysender.tryupdate(messaging.sender.id, messageuniqueid, existinguniqueid);                 return false;             }         }         _messageuniquekeysbysender.tryadd(messaging.sender.id, messageuniqueid);         return false;     }

and checking in main code

try         {             if (!isduplicate(messaging))             {                 var conversation = _conversationrepository[messaging.sender.id] ?? new conversation(messaging.sender.id);                 message = await _bot.respondtomessagingasync(conversation, messaging);                 _conversationrepository[messaging.sender.id] = conversation;                 _logger.forcontext("facebookmessage", messagingjson).logduration("processing facebook message", sw);             }             else                 _logger.forcontext("facebookmessage", messagingjson).warning("duplicate message skipped");         }         catch (exception ex)         {             _logger.forcontext("facebookmessage", messagingjson).error(ex, "failed process message");             message = new textmessage(resources.error);             haserror = true;         }

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