hmm this is problematic

src/fsfw/tmtcpacket/SpacePacketCreator.cpp

@@ -23,8 +23,7 @@ SpacePacketCreator::SpacePacketCreator(ccsds::PacketType packetType, bool secHea
     return;
   }
   version = version_;
-  packetId =
+  packetId = (static_cast<uint16_t>(packetType) << 12) | (static_cast<uint16_t>(secHeaderFlag) << 11) | apid;
-      (version_ << 13) | (static_cast<uint8_t>(packetType) << 12) | (secHeaderFlag << 11) | apid;
   packetSeqCtrl = static_cast<uint8_t>(seqFlags) << 14 | seqCount;
   dataLen = dataLen_;
 }
@@ -53,3 +52,4 @@ ReturnValue_t SpacePacketCreator::deSerialize(const uint8_t **buffer, size_t *si
                                               SerializeIF::Endianness streamEndianness) {
   return HasReturnvaluesIF::RETURN_FAILED;
 }
+bool SpacePacketCreator::isValid() const { return valid; }

src/fsfw/tmtcpacket/SpacePacketCreator.h

@@ -11,7 +11,7 @@ class SpacePacketCreator : public SerializeIF, public SpacePacketIF {
                      uint8_t version = 0);
   SpacePacketCreator(uint16_t packetId, uint16_t packetSeqCtrl, uint16_t dataLen,
                      uint8_t version = 0);
-  bool valid;
+  [[nodiscard]] bool isValid() const;
   [[nodiscard]] uint16_t getPacketId() const override;
   [[nodiscard]] uint16_t getPacketSeqCtrl() const override;
   [[nodiscard]] uint16_t getPacketDataLen() const override;
@@ -22,6 +22,7 @@ class SpacePacketCreator : public SerializeIF, public SpacePacketIF {
                             Endianness streamEndianness) override;
 
  private:
+  bool valid;
   uint16_t packetId;
   uint16_t packetSeqCtrl;
   uint16_t dataLen;

tests/src/fsfw_tests/unit/tmtcpacket/testCcsds.cpp

@@ -1,9 +1,14 @@
+#include <array>
 #include <catch2/catch_test_macros.hpp>
 
 #include "fsfw/tmtcpacket/SpacePacketCreator.h"
 #include "fsfw/tmtcpacket/SpacePacketReader.h"
 
 TEST_CASE("CCSDS Test", "[ccsds]") {
+  SpacePacketCreator base = SpacePacketCreator(
+      ccsds::PacketType::TC, true, 0x02,
+      ccsds::SequenceFlags::FIRST_SEGMENT,  0x34, 0x16);
+
   SECTION("Constexpr Helpers") {
     REQUIRE(ccsds::getTcSpacePacketIdFromApid(0x22) == 0x1822);
     REQUIRE(ccsds::getTmSpacePacketIdFromApid(0x22) == 0x0822);
@@ -12,15 +17,27 @@ TEST_CASE("CCSDS Test", "[ccsds]") {
     REQUIRE(ccsds::getTmSpacePacketIdFromApid(0x7ff) == 0xfff);
   }
 
-  SECTION("Header Creator Tests") {
+  SECTION("Basic Test") {
-    SpacePacketCreator base = SpacePacketCreator(
+    REQUIRE(base.isValid());
-        ccsds::PacketType::TC, true, 0x02,
-        ccsds::SequenceFlags::FIRST_SEGMENT,  0x34, 0x16);
     REQUIRE(base.getApid() == 0x02);
     REQUIRE(base.getSequenceFlags() == ccsds::SequenceFlags::FIRST_SEGMENT);
     REQUIRE(base.getVersion() == 0b000);
     REQUIRE(base.getSequenceCount() == 0x34);
     REQUIRE(base.getPacketDataLen() == 0x16);
     REQUIRE(base.getPacketType() == ccsds::PacketType::TC);
+    REQUIRE(base.getPacketId() == 0x1802);
+  }
+
+  SECTION("Raw Output") {
+    std::array<uint8_t, 6> buf {};
+    uint8_t* bufPtr = buf.data();
+    size_t serLen = 0;
+    base.serialize(&bufPtr, &serLen, buf.size(),  SerializeIF::Endianness::MACHINE);
+    REQUIRE(buf[0] == 0x18);
+    REQUIRE(buf[1] == 0x02);
+    REQUIRE(buf[2] == 0x40);
+    REQUIRE(buf[3] == 0x34);
+    REQUIRE(buf[4] == 0x00);
+    REQUIRE(buf[5] == 0x16);
   }
 }