Fix issue for 5GMMCapability

src/nas/ies/5GMMCapability.cpp

@@ -97,8 +97,7 @@ int _5GMMCapability::decodeFromBuffer(uint8_t* buf, int len, bool is_option) {
 
   Logger::nas_mm().debug("Decoding _5GMMCapability IE");
   if (is_option) {
-    DECODE_U8(buf + decoded_size, octet, decoded_size);
-    iei_ = std::optional<uint8_t>(octet);
+    DECODE_U8(buf + decoded_size, iei_, decoded_size);
   }
 
   DECODE_U8(buf + decoded_size, length, decoded_size);

src/nas/ies/5GMMCapability.hpp

@@ -22,6 +22,7 @@
 #ifndef _5GMM_CAPABILITY_H_
 #define _5GMM_CAPABILITY_H_
 
+#include <optional>
 #include <stdint.h>
 
 constexpr uint8_t k5gmmCapabilityMinimumLength = 3;

src/nas/ies/Type4NasIe.cpp

@@ -77,8 +77,7 @@ int Type4NasIe::Encode(uint8_t* buf, const int& len) {
 }
 
 //------------------------------------------------------------------------------
-int Type4NasIe::Decode(
-    const uint8_t* const buf, const int& len, bool is_iei = false) {
+int Type4NasIe::Decode(const uint8_t* const buf, const int& len, bool is_iei) {
   Logger::nas_mm().debug("Decoding %s", GetIeName().c_str());
 
   if (!Validate(len)) return KEncodeDecodeError;

src/nas/msgs/RegistrationRequest.cpp

@@ -197,7 +197,8 @@ void RegistrationRequest::set5GMMCapability(uint8_t value) {
 //------------------------------------------------------------------------------
 bool RegistrationRequest::get5GMMCapability(uint8_t& value) {
   if (ie_5g_mm_capability.has_value()) {
-    value = ie_5g_mm_capability.value().getValue();
+    value =
+        ie_5g_mm_capability.value().getOctet3();  // TODO: get multiple octets
     return true;
   } else
     return false;