Postbacks in fbdirect

Hi,

I'm playing around with the sample fbdirect and it works fine with my Facebook bot with single text as the request.
But when I'm trying to send postback with payload like:
```
#me
{
"postback": {
"payload": "Some payload"
}
}

#bot
Hi

```

my webhook receives no requests.
Could you please assist how to send postbacks in fbdirect mode?

Thanks

Log:
info login Logging in...
info login Logged in
info login Request to reconnect
info login Request to pull 1
info login Request to pull 2
info login Request to thread_sync
info login Done logging in.
botium-FbContainer logging into facebook ready +4s
testmybot-main running testcase 1 simplecalc +5s
botium-Convo simplecalc/Line 10: user says ConvoStep {
botium-Convo sender: 'me',
botium-Convo channel: null,
botium-Convo messageText: undefined,
botium-Convo sourceData: { postback: { payload: 'Some payload' } },
botium-Convo stepTag: 'Line 10',
botium-Convo not: false } +0ms
botium-Convo simplecalc wait for bot null +1ms
verb parseAndCheckLogin for (;;); {"t":"lb","lb_info":{"sticky":"116","pool":"frc3c09_chat-proxy"}}
info listen Got answer in 1086
verb parseAndCheckLogin for (;;); {"t":"msg","seq":2,"u":100022186592372,"ms":[{"type":"qprimer","made":"1528979655753"},{"type":"chatproxy-presence","buddyList":{"100003867865366":{"lat":1528975383},"633289663":{"lat":1528978677,"p":0,"vc":74},"100000487878525":{"lat":1528964405},"100000206799455":{"lat":1528978191},"100010071075103":{"lat":1528880316},"100001539813339":{"lat":1528979480,"p":2,"vc":0},"1614563253":{"lat":1528976904},"100001634492156":{"lat":1528975456},"100007152941774":{"lat":1528957755},"100023696302865":{"lat":1528976233},"1350133715":{"lat":1528952363},"100001586754582":{"lat":1528976173,"p":0,"vc":74},"100008372501565":{"lat":1528895349},"100001867372118":{"lat":1528951938},"100008021356269":{"lat":1528973417},"100015217624961":{"lat":1528965640},"100009864851286":{"lat":-1},"100000332668840":{"lat":-1},"1412043987":{"lat":1528977813},"100001452100429":{"lat":1528922061},"100001654392863":{"lat":1528830352},"100002125018927":{"lat":1528969407}},"userIsIdle":false,"chatNotif":0,"gamers":[]}]}
info listen Got answer in 288
verb parseAndCheckLogin for (;;); {"t":"heartbeat"}
verb parseAndCheckLogin
info listen Got answer in 50493
botium-BaseContainer WaitBotSays error Error: Queue.pop timeout after 60000

Start with the fbdirect sample and trace how the shown postback sourceData is converted into an outgoing request. Reproduce the example payload and inspect the webhook behavior and timeout in the log. Done means a postback in fbdirect mode reaches the webhook and the bot reply is received.

Written by the indexing model from the issue text.