Function insertChat

Adds a chat message.

Author: LiveSmart info@new-dev.com
Located at script.php

Parameters summary
`type`	`$roomId`
`type`	`$message`
`type`	`$agent`
`type`	`$from`
`type`	`$participants`
`type`	`$agentId = null`
`type`	`$system = null`
`type`	`$avatar = null`
`type`	`$datetime = null`

Return value summary
`string\|integer`	string\|int