Read a value from a queue/mailbox.
Read a value from a mailbox and optionally remove it. If the local mailbox is empty and this NXT is the master then it attempts to poll one of its slave NXTs for a message from the response mailbox that corresponds to the specified local mailbox number. Output the value in string, number, and boolean form.
- Parameters:
-
| _queue | The mailbox number. See Mailbox constants. |
| _clear | A flag indicating whether to remove the message from the mailbox after it has been read. |
| _str | The string value that is read from the mailbox. |
| _val | The numeric value that is read from the mailbox. |
| _bval | The boolean value that is read from the mailbox. |
| _result | A char value indicating whether the function call succeeded or not. |