'Send the data as string.
payload: Payload must be utf-8 string or unicode,
if the opcode is OPCODE_TEXT.
Otherwise, it must be string(byte array)
opcode: operation code to send. Please see OPCODE_XXX.'

def send(self, payload, opcode=ABNF.OPCODE_TEXT):

    frame = ABNF.create_frame(payload, opcode)
    return self.send_frame(frame)
