diff --git a/3rdparty/libe2ap/Fourframes.c b/3rdparty/libe2ap/Fourframes.c
new file mode 100644
index 0000000..183e2a6
--- /dev/null
+++ b/3rdparty/libe2ap/Fourframes.c
@@ -0,0 +1,67 @@
+/*
+ * Generated by asn1c-0.9.29 (http://lionet.info/asn1c)
+ * From ASN.1 module "X2AP-IEs"
+ * 	found in "Spec/e2_and_x2-combined-and-minimized.asn1"
+ * 	`asn1c -pdu=auto -fincludes-quoted -fcompound-names -fno-include-deps -gen-PER -no-gen-OER -no-gen-example`
+ */
+
+#include "Fourframes.h"
+
+int
+Fourframes_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
+			asn_app_constraint_failed_f *ctfailcb, void *app_key) {
+	const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
+	size_t size;
+	
+	if(!sptr) {
+		ASN__CTFAIL(app_key, td, sptr,
+			"%s: value not given (%s:%d)",
+			td->name, __FILE__, __LINE__);
+		return -1;
+	}
+	
+	if(st->size > 0) {
+		/* Size in bits */
+		size = 8 * st->size - (st->bits_unused & 0x07);
+	} else {
+		size = 0;
+	}
+	
+	if((size == 24)) {
+		/* Constraint check succeeded */
+		return 0;
+	} else {
+		ASN__CTFAIL(app_key, td, sptr,
+			"%s: constraint failed (%s:%d)",
+			td->name, __FILE__, __LINE__);
+		return -1;
+	}
+}
+
+/*
+ * This type is implemented using BIT_STRING,
+ * so here we adjust the DEF accordingly.
+ */
+asn_per_constraints_t asn_PER_type_Fourframes_constr_1 CC_NOTUSED = {
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	{ APC_CONSTRAINED,	 0,  0,  24,  24 }	/* (SIZE(24..24)) */,
+	0, 0	/* No PER value map */
+};
+static const ber_tlv_tag_t asn_DEF_Fourframes_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (3 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_Fourframes = {
+	"Fourframes",
+	"Fourframes",
+	&asn_OP_BIT_STRING,
+	asn_DEF_Fourframes_tags_1,
+	sizeof(asn_DEF_Fourframes_tags_1)
+		/sizeof(asn_DEF_Fourframes_tags_1[0]), /* 1 */
+	asn_DEF_Fourframes_tags_1,	/* Same as above */
+	sizeof(asn_DEF_Fourframes_tags_1)
+		/sizeof(asn_DEF_Fourframes_tags_1[0]), /* 1 */
+	{ 0, &asn_PER_type_Fourframes_constr_1, Fourframes_constraint },
+	0, 0,	/* No members */
+	&asn_SPC_BIT_STRING_specs	/* Additional specs */
+};
+