finish with request

common/cpp/include/system_wrappers/io.h

receiver/CMakeLists.txt

receiver/src/connection.cpp

receiver/src/connection.h

receiver/src/receiver_error.h

receiver/src/request.cpp

receiver/src/request.h

receiver/src/request_handler.cpp

receiver/src/request_handler.h

receiver/src/send_data_request.cpp

receiver/src/send_data_request.h

receiver/unittests/test_connection.cpp

receiver/unittests/test_request.cpp