Bulk messaging support

[kkamkou]

Add a new functionality to send multiple messages at once.

[rosygupta]

hi @kkamkou ,
Currently can you confirm is chunking is done in the default message sending via UDP? I tried sending message of 25353 bytes which got trimmed and sent only the first half of the message.
Thanks

[kkamkou]

Yes, chunking is implemented from the first version of the library (UDP). Also consider is that 32766 bytes is the maximum length for a field (message might have many fields).

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