def ping(self, data = None, timeout = 3):
        if data is None:
            data = "abcdefghijklmnopqrstuvwxyz" * 20
        res = self.async_request(consts.HANDLE_PING, data, timeout = timeout)
        if res.value != data:
            raise PingError("echo mismatches sent data")
Make sure only two character country codes are allowed
dataset/ETHPy150Open sccn/SNAP/src/rpyc/core/protocol.py/Connection.ping--crossover with--dataset/ETHPy150Open SpriteLink/NIPAP/tests/nipaptest.py/TestCountryCodeValue.test_country_code_length