Allows to create a new SEQ frame placing the result into the provided buffer.
SEQ frame are especial to BEEP because they allows to control how flow control is handled based on channel window size.
|channel_num ||The channel number where the channel will|
|ackno ||The sequence number expected to be received at the time the SEQ frame was generated.|
|window_size ||The window size that the SEQ frame will acknowledge.|
|buffer ||The buffer that will hold the content.|
|buffer_size ||The buffer size.|
|result_size ||Reference to an integer variable where the size of the result will be returned.|
- A newly allocated raw SEQ frame. Returned value should be deallocated using axl_free.