diff --git a/e2sm/lib/SST.c b/e2sm/lib/SST.c
new file mode 100644
index 0000000..2712cd1
--- /dev/null
+++ b/e2sm/lib/SST.c
@@ -0,0 +1,65 @@
+/*
+ * Generated by asn1c-0.9.29 (http://lionet.info/asn1c)
+ * From ASN.1 module "E2SM-RC-IEs"
+ * 	found in "e2sm-rc-nov2021.asn"
+ * 	`asn1c -fcompound-names -fno-include-deps -findirect-choice -pdu=auto -gen-PER -gen-OER -no-gen-example -D .`
+ */
+
+#include "SST.h"
+
+int
+SST_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
+			asn_app_constraint_failed_f *ctfailcb, void *app_key) {
+	const OCTET_STRING_t *st = (const OCTET_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;
+	}
+	
+	size = st->size;
+	
+	if((size == 1)) {
+		/* 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 OCTET_STRING,
+ * so here we adjust the DEF accordingly.
+ */
+static asn_oer_constraints_t asn_OER_type_SST_constr_1 CC_NOTUSED = {
+	{ 0, 0 },
+	1	/* (SIZE(1..1)) */};
+asn_per_constraints_t asn_PER_type_SST_constr_1 CC_NOTUSED = {
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	{ APC_CONSTRAINED,	 0,  0,  1,  1 }	/* (SIZE(1..1)) */,
+	0, 0	/* No PER value map */
+};
+static const ber_tlv_tag_t asn_DEF_SST_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_SST = {
+	"SST",
+	"SST",
+	&asn_OP_OCTET_STRING,
+	asn_DEF_SST_tags_1,
+	sizeof(asn_DEF_SST_tags_1)
+		/sizeof(asn_DEF_SST_tags_1[0]), /* 1 */
+	asn_DEF_SST_tags_1,	/* Same as above */
+	sizeof(asn_DEF_SST_tags_1)
+		/sizeof(asn_DEF_SST_tags_1[0]), /* 1 */
+	{ &asn_OER_type_SST_constr_1, &asn_PER_type_SST_constr_1, SST_constraint },
+	0, 0,	/* No members */
+	&asn_SPC_OCTET_STRING_specs	/* Additional specs */
+};
+