diff --git a/src/main.cpp b/src/main.cpp
index 472ed89..033e20a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -98,37 +98,37 @@ PYBIND11_MODULE(stormpci_bin_reader, m) {
 
     py::class_<StormProcess_tSATELLITETYPE>(m, "StormProcess_tSATELLITETYPE")
         .def(py::init<>())
-        .def_readwrite("SVID", &StormProcess_tSATELLITETYPE::SVID)
-        .def_readwrite("mode", &StormProcess_tSATELLITETYPE::mode)
-        .def_readwrite("signal_strength", &StormProcess_tSATELLITETYPE::signal_strength)
-        .def_readwrite("channel_status", &StormProcess_tSATELLITETYPE::channel_status)
+        .def_readonly("SVID", &StormProcess_tSATELLITETYPE::SVID)
+        .def_readonly("mode", &StormProcess_tSATELLITETYPE::mode)
+        .def_readonly("signal_strength", &StormProcess_tSATELLITETYPE::signal_strength)
+        .def_readonly("channel_status", &StormProcess_tSATELLITETYPE::channel_status)
         ;
 
     py::class_<StormProcess_tTIMESTAMPINFO>(m, "StormProcess_tTIMESTAMPINFO")
         .def(py::init<>())
-        .def_readwrite("TS_valid", &StormProcess_tTIMESTAMPINFO::TS_valid)
-        .def_readwrite("TS_Osc", &StormProcess_tTIMESTAMPINFO::TS_Osc)
-        .def_readwrite("TS_time", &StormProcess_tTIMESTAMPINFO::TS_time)
-        .def_readwrite("TS_10ms", &StormProcess_tTIMESTAMPINFO::TS_10ms)
-        .def_readwrite("capture_time", &StormProcess_tTIMESTAMPINFO::capture_time)
-        .def_readwrite("gps_data_valid", &StormProcess_tTIMESTAMPINFO::gps_data_valid)
-        .def_readwrite("month", &StormProcess_tTIMESTAMPINFO::month)
-        .def_readwrite("day", &StormProcess_tTIMESTAMPINFO::day)
-        .def_readwrite("year", &StormProcess_tTIMESTAMPINFO::year)
-        .def_readwrite("hours", &StormProcess_tTIMESTAMPINFO::hours)
-        .def_readwrite("minutes", &StormProcess_tTIMESTAMPINFO::minutes)
-        .def_readwrite("seconds", &StormProcess_tTIMESTAMPINFO::seconds)
-        .def_readwrite("latitude_mas", &StormProcess_tTIMESTAMPINFO::latitude_mas)
-        .def_readwrite("longitude_mas", &StormProcess_tTIMESTAMPINFO::longitude_mas)
-        .def_readwrite("latitude_ns", &StormProcess_tTIMESTAMPINFO::latitude_ns)
-        .def_readwrite("longitude_ew", &StormProcess_tTIMESTAMPINFO::longitude_ew)
-        .def_readwrite("height_cm", &StormProcess_tTIMESTAMPINFO::height_cm)
-        .def_readwrite("dop", &StormProcess_tTIMESTAMPINFO::dop)
-        .def_readwrite("satellites_visible", &StormProcess_tTIMESTAMPINFO::satellites_visible)
-        .def_readwrite("satellites_tracked", &StormProcess_tTIMESTAMPINFO::satellites_tracked)
-        .def_readwrite("receiver_status", &StormProcess_tTIMESTAMPINFO::receiver_status)
-        .def_readwrite("oscillator_temperature", &StormProcess_tTIMESTAMPINFO::oscillator_temperature)
-        .def_readwrite("serial_number", &StormProcess_tTIMESTAMPINFO::serial_number)
+        .def_readonly("TS_valid", &StormProcess_tTIMESTAMPINFO::TS_valid)
+        .def_readonly("TS_Osc", &StormProcess_tTIMESTAMPINFO::TS_Osc)
+        .def_readonly("TS_time", &StormProcess_tTIMESTAMPINFO::TS_time)
+        .def_readonly("TS_10ms", &StormProcess_tTIMESTAMPINFO::TS_10ms)
+        .def_readonly("capture_time", &StormProcess_tTIMESTAMPINFO::capture_time)
+        .def_readonly("gps_data_valid", &StormProcess_tTIMESTAMPINFO::gps_data_valid)
+        .def_readonly("month", &StormProcess_tTIMESTAMPINFO::month)
+        .def_readonly("day", &StormProcess_tTIMESTAMPINFO::day)
+        .def_readonly("year", &StormProcess_tTIMESTAMPINFO::year)
+        .def_readonly("hours", &StormProcess_tTIMESTAMPINFO::hours)
+        .def_readonly("minutes", &StormProcess_tTIMESTAMPINFO::minutes)
+        .def_readonly("seconds", &StormProcess_tTIMESTAMPINFO::seconds)
+        .def_readonly("latitude_mas", &StormProcess_tTIMESTAMPINFO::latitude_mas)
+        .def_readonly("longitude_mas", &StormProcess_tTIMESTAMPINFO::longitude_mas)
+        .def_readonly("latitude_ns", &StormProcess_tTIMESTAMPINFO::latitude_ns)
+        .def_readonly("longitude_ew", &StormProcess_tTIMESTAMPINFO::longitude_ew)
+        .def_readonly("height_cm", &StormProcess_tTIMESTAMPINFO::height_cm)
+        .def_readonly("dop", &StormProcess_tTIMESTAMPINFO::dop)
+        .def_readonly("satellites_visible", &StormProcess_tTIMESTAMPINFO::satellites_visible)
+        .def_readonly("satellites_tracked", &StormProcess_tTIMESTAMPINFO::satellites_tracked)
+        .def_readonly("receiver_status", &StormProcess_tTIMESTAMPINFO::receiver_status)
+        .def_readonly("oscillator_temperature", &StormProcess_tTIMESTAMPINFO::oscillator_temperature)
+        .def_readonly("serial_number", &StormProcess_tTIMESTAMPINFO::serial_number)
         .def_property_readonly("satellite", [](const StormProcess_tTIMESTAMPINFO &lts2) {
             return std::vector<StormProcess_tSATELLITETYPE> (lts2.satellite, lts2.satellite + sizeof(lts2.satellite));
         })
@@ -145,16 +145,16 @@ PYBIND11_MODULE(stormpci_bin_reader, m) {
         .def_property_readonly("EastBuf", [](const StrikeData &sdata) {
             return std::vector<double> (sdata.EastBuf, sdata.EastBuf + BOLTEK_BUFFERSIZE);
         })
-        .def_readwrite("NorthMaxPos", &StrikeData::NorthMaxPos)
-        .def_readwrite("NorthMinPos", &StrikeData::NorthMinPos)
-        .def_readwrite("EastMaxPos", &StrikeData::EastMaxPos)
-        .def_readwrite("EastMinPos", &StrikeData::EastMinPos)
-        .def_readwrite("North_Pk", &StrikeData::North_Pk)
-        .def_readwrite("East_Pk", &StrikeData::East_Pk)
-        .def_readwrite("NorthPol", &StrikeData::NorthPol)
-        .def_readwrite("EastPol", &StrikeData::EastPol)
-        .def_readwrite("EFieldPol", &StrikeData::EFieldPol)
-        .def_readwrite("lts2_data", &StrikeData::lts2_data)
+        .def_readonly("NorthMaxPos", &StrikeData::NorthMaxPos)
+        .def_readonly("NorthMinPos", &StrikeData::NorthMinPos)
+        .def_readonly("EastMaxPos", &StrikeData::EastMaxPos)
+        .def_readonly("EastMinPos", &StrikeData::EastMinPos)
+        .def_readonly("North_Pk", &StrikeData::North_Pk)
+        .def_readonly("East_Pk", &StrikeData::East_Pk)
+        .def_readonly("NorthPol", &StrikeData::NorthPol)
+        .def_readonly("EastPol", &StrikeData::EastPol)
+        .def_readonly("EFieldPol", &StrikeData::EFieldPol)
+        .def_readonly("lts2_data", &StrikeData::lts2_data)
         ;