def METHOD_NAME(smpp_sms_provider, dummy_smpp_server):
    dummy_smpp_server.reset()
    assert smpp_sms_provider._submitMessage("987654", "Hello world")
    assert [pdu.command for pdu in dummy_smpp_server.pdus] == [
        "bind_transceiver",
        "bind_transceiver_resp",
        "submit_sm",
        "submit_sm_resp",
        "unbind",
        "unbind_resp",
    ]
    assert dummy_smpp_server.messages == ["Hello world"]