Forum Discussion
As you know post needs the user to be logged in.
If you have already logged in and already have the session, just call the Rest Api to post: /boards/id/[id]/messages/post?message.subject="subject"&message.body="body"
It will be slightly different if your call is from outside community.
You need to login first:
http:/yourcommunity.com/restapi/vc/authentication/sessions/login?user.login=username&user.password=password
get the session key from the response (sessionKey).
and then post:
http:/yourcommunity.com/restapi/vc/boards/id/[id]/messages/post?message.subject="subject"&message.body="body"&restapi.session_key=sessionKey
Please find the detailed Api here:
http://community.lithium.com/t5/Community-API/bd-p/developers-rest-api?page=authentication
http://community.lithium.com/t5/Community-API/bd-p/developers-rest-api?leaf-id=Board.messages.post#Board.messages.post