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Feature Request

Currently, Direct Line Speech do not ACK any outgoing message, including recognized speech or simple text message.

Since outgoing activities are not ACK-ed, we do not have the activity ID or the correct timestamp.

We workaround it by timestamping all incoming activities with local timestamp, and faking a read receipt (a.k.a. echo back activity).

Code at /directlinespeech/src/DirectLineSpeech.js.

[Enhancement]