diff --git a/src/asn1c/ESN.c b/src/asn1c/ESN.c
new file mode 100644
index 0000000..efd294c
--- /dev/null
+++ b/src/asn1c/ESN.c
@@ -0,0 +1,172 @@
+/*
+ * Generated by asn1c-0.9.28 (http://lionet.info/asn1c)
+ * From ASN.1 module "HNBAP-IEs"
+ * 	found in "../../asn1/hnbap/HNBAP-IEs.asn"
+ * 	`asn1c -gen-PER -fnative-types`
+ */
+
+#include "ESN.h"
+
+int
+ESN_constraint(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 == 32l)) {
+		/* 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.
+ */
+static void
+ESN_1_inherit_TYPE_descriptor(asn_TYPE_descriptor_t *td) {
+	td->free_struct    = asn_DEF_BIT_STRING.free_struct;
+	td->print_struct   = asn_DEF_BIT_STRING.print_struct;
+	td->check_constraints = asn_DEF_BIT_STRING.check_constraints;
+	td->ber_decoder    = asn_DEF_BIT_STRING.ber_decoder;
+	td->der_encoder    = asn_DEF_BIT_STRING.der_encoder;
+	td->xer_decoder    = asn_DEF_BIT_STRING.xer_decoder;
+	td->xer_encoder    = asn_DEF_BIT_STRING.xer_encoder;
+	td->uper_decoder   = asn_DEF_BIT_STRING.uper_decoder;
+	td->uper_encoder   = asn_DEF_BIT_STRING.uper_encoder;
+	td->aper_decoder   = asn_DEF_BIT_STRING.aper_decoder;
+	td->aper_encoder   = asn_DEF_BIT_STRING.aper_encoder;
+	if(!td->per_constraints)
+		td->per_constraints = asn_DEF_BIT_STRING.per_constraints;
+	td->elements       = asn_DEF_BIT_STRING.elements;
+	td->elements_count = asn_DEF_BIT_STRING.elements_count;
+	td->specifics      = asn_DEF_BIT_STRING.specifics;
+}
+
+void
+ESN_free(asn_TYPE_descriptor_t *td,
+		void *struct_ptr, int contents_only) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	td->free_struct(td, struct_ptr, contents_only);
+}
+
+int
+ESN_print(asn_TYPE_descriptor_t *td, const void *struct_ptr,
+		int ilevel, asn_app_consume_bytes_f *cb, void *app_key) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->print_struct(td, struct_ptr, ilevel, cb, app_key);
+}
+
+asn_dec_rval_t
+ESN_decode_ber(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+		void **structure, const void *bufptr, size_t size, int tag_mode) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->ber_decoder(opt_codec_ctx, td, structure, bufptr, size, tag_mode);
+}
+
+asn_enc_rval_t
+ESN_encode_der(asn_TYPE_descriptor_t *td,
+		void *structure, int tag_mode, ber_tlv_tag_t tag,
+		asn_app_consume_bytes_f *cb, void *app_key) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->der_encoder(td, structure, tag_mode, tag, cb, app_key);
+}
+
+asn_dec_rval_t
+ESN_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+		void **structure, const char *opt_mname, const void *bufptr, size_t size) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->xer_decoder(opt_codec_ctx, td, structure, opt_mname, bufptr, size);
+}
+
+asn_enc_rval_t
+ESN_encode_xer(asn_TYPE_descriptor_t *td, void *structure,
+		int ilevel, enum xer_encoder_flags_e flags,
+		asn_app_consume_bytes_f *cb, void *app_key) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->xer_encoder(td, structure, ilevel, flags, cb, app_key);
+}
+
+asn_dec_rval_t
+ESN_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+		asn_per_constraints_t *constraints, void **structure, asn_per_data_t *per_data) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->uper_decoder(opt_codec_ctx, td, constraints, structure, per_data);
+}
+
+asn_enc_rval_t
+ESN_encode_uper(asn_TYPE_descriptor_t *td,
+		asn_per_constraints_t *constraints,
+		void *structure, asn_per_outp_t *per_out) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->uper_encoder(td, constraints, structure, per_out);
+}
+
+asn_enc_rval_t
+ESN_encode_aper(asn_TYPE_descriptor_t *td,
+		asn_per_constraints_t *constraints,
+		void *structure, asn_per_outp_t *per_out) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->aper_encoder(td, constraints, structure, per_out);
+}
+
+asn_dec_rval_t
+ESN_decode_aper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+		asn_per_constraints_t *constraints, void **structure, asn_per_data_t *per_data) {
+	ESN_1_inherit_TYPE_descriptor(td);
+	return td->aper_decoder(opt_codec_ctx, td, constraints, structure, per_data);
+}
+
+static asn_per_constraints_t asn_PER_type_ESN_constr_1 GCC_NOTUSED = {
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	{ APC_CONSTRAINED,	 0,  0,  32l,  32l }	/* (SIZE(32..32)) */,
+	0, 0	/* No PER value map */
+};
+static const ber_tlv_tag_t asn_DEF_ESN_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (3 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_ESN = {
+	"ESN",
+	"ESN",
+	ESN_free,
+	ESN_print,
+	ESN_constraint,
+	ESN_decode_ber,
+	ESN_encode_der,
+	ESN_decode_xer,
+	ESN_encode_xer,
+	ESN_decode_uper,
+	ESN_encode_uper,
+	ESN_decode_aper,
+	ESN_encode_aper,
+	0,	/* Use generic outmost tag fetcher */
+	asn_DEF_ESN_tags_1,
+	sizeof(asn_DEF_ESN_tags_1)
+		/sizeof(asn_DEF_ESN_tags_1[0]), /* 1 */
+	asn_DEF_ESN_tags_1,	/* Same as above */
+	sizeof(asn_DEF_ESN_tags_1)
+		/sizeof(asn_DEF_ESN_tags_1[0]), /* 1 */
+	&asn_PER_type_ESN_constr_1,
+	0, 0,	/* No members */
+	0	/* No specifics */
+};
+