diff --git a/tests/iec62056/Makefile b/tests/iec62056/Makefile
new file mode 100644
index 0000000000000..bb30de064eded
--- /dev/null
+++ b/tests/iec62056/Makefile
@@ -0,0 +1,7 @@
+include ../Makefile.tests_common
+
+USEMODULE += iec62056
+USEMODULE += printf_float
+USEMODULE += embunit
+
+include $(RIOTBASE)/Makefile.include
diff --git a/tests/iec62056/README.md b/tests/iec62056/README.md
new file mode 100644
index 0000000000000..fd998a1325673
--- /dev/null
+++ b/tests/iec62056/README.md
@@ -0,0 +1,4 @@
+iec62056
+========
+
+This is an automated test to parse iec62056-21 telegrams and data structures
diff --git a/tests/iec62056/main.c b/tests/iec62056/main.c
new file mode 100644
index 0000000000000..9115c1f68ff0e
--- /dev/null
+++ b/tests/iec62056/main.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2023 Koen Zandberg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for IEC 62056
+ *
+ * @author      Koen Zandberg <koen@bergzand.net>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "embUnit.h"
+#include "iec62056/obis.h"
+#include "iec62056/21.h"
+#include "container.h"
+
+typedef struct {
+    const char *input;
+    int expected_result;
+    iec62056_obis_t obis;
+} test_obis_input_t;
+
+static const test_obis_input_t id_tests[] = {
+    { "1-2:3.4.5.6", 0, { 1, 2, 3, 4, 5, 6 } },
+    { "2:3.4.5.6", 0, { 255, 2, 3, 4, 5, 6 } },
+    { "1-3.4.5.6", 0, { 1, 255, 3, 4, 5, 6 } },
+    { "1-2:3.4.5", 0, { 1, 2, 3, 4, 5, 255 } },
+    { "3.4", 0, { 255, 255, 3, 4, 255, 255 } },
+    { "", -1, { 0 } },
+    { "256-2:3.4.5.6", -1, { 0 } },
+    { "1-256:3.4.5.6", -1, { 0 } },
+    { "1-2:256.4.5.6", -1, { 0 } },
+    { "1-2:3.256.5.6", -1, { 0 } },
+    { "1-2:3.4.256.6", -1, { 0 } },
+    { "1-2:3.4.5.256", -1, { 0 } },
+};
+
+static void test_iec62056_obis(void)
+{
+    for (size_t i = 0; i < ARRAY_SIZE(id_tests); i++) {
+        iec62056_obis_t obis;
+        memset(&obis, 0, sizeof(iec62056_obis_t));
+        int res = iec62056_obis_from_string(&obis, id_tests[i].input, strlen(id_tests[i].input));
+        TEST_ASSERT_EQUAL_INT(res, id_tests[i].expected_result);
+        if (res == 0) {
+            TEST_ASSERT_EQUAL_INT(0, memcmp(&id_tests[i].obis, &obis, sizeof(iec62056_obis_t)));
+        }
+    }
+}
+
+typedef struct {
+    const char *input;
+    int expected_result;
+    int64_t mantissa;
+    int64_t exponent;
+    const char *unit;
+} test_register_input_t;
+
+static const test_register_input_t register_tests[] = {
+    { "123.456*kWh", 0, 123456, -3, "kWh" },
+    { "0011235", 0, 11235, 0, NULL },
+    { "-11235.3248", 0, -112353248, -4, NULL },
+    { "001*A", 0, 1, 0, "A" },
+    { "01*A.123", -1, 0, 0, "" },
+    { "AABBCC", -1, 0, 0, "" },
+    { "12AB.3", -1, 0, 0, "" },
+    { "12.3A", -1, 0, 0, "" }
+};
+
+static void test_iec62056_21_register(void)
+{
+    for (size_t i = 0; i < ARRAY_SIZE(register_tests); i++) {
+        const test_register_input_t *test = &register_tests[i];
+        char unit[20] = { 0 };
+        int64_t mantissa, exponent;
+
+        iec62056_21_dataset_t dataset = {
+            .obis = { 0 },
+            .value = register_tests[i].input,
+            .value_length = strlen(register_tests[i].input),
+        };
+
+        int res = iec62056_21_dataset_parse_register_to_decfrac(&dataset, &mantissa, &exponent);
+        iec62056_21_dataset_parse_register_unit(&dataset, unit, sizeof(unit));
+
+        TEST_ASSERT_EQUAL_INT(test->expected_result, res);
+        if (res == 0) {
+            TEST_ASSERT_EQUAL_INT(test->mantissa, mantissa);
+            TEST_ASSERT_EQUAL_INT(test->exponent, exponent);
+            if (test->unit) {
+                TEST_ASSERT_EQUAL_INT(0, strcmp(test->unit, unit));
+            }
+        }
+    }
+}
+
+static const char input_telegram[] =
+    "/Ene5\\XS210 ESMR 5.0\r\n"
+    "\r\n"
+    "1-3:0.2.8(50)\r\n"
+    "0-0:1.0.0(230104215905W)\r\n"
+    "0-0:96.1.1(4530303631303030303031313638373230)\r\n"
+    "1-0:1.8.1(000233.793*kWh)\r\n"
+    "1-0:1.8.2(000300.631*kWh)\r\n"
+    "1-0:2.8.1(000000.043*kWh)\r\n"
+    "1-0:2.8.2(000000.000*kWh)\r\n"
+    "0-0:96.14.0(0002)\r\n"
+    "1-0:1.7.0(00.416*kW)\r\n"
+    "1-0:2.7.0(00.000*kW)\r\n"
+    "0-0:96.7.21(00003)\r\n"
+    "0-0:96.7.9(00001)\r\n"
+    "1-0:99.97.0(0)(0-0:96.7.19)\r\n"
+    "1-0:32.32.0(00001)\r\n"
+    "1-0:32.36.0(00000)\r\n"
+    "0-0:96.13.0()\r\n"
+    "1-0:32.7.0(237.0*V)\r\n"
+    "1-0:31.7.0(001*A)\r\n"
+    "1-0:21.7.0(00.416*kW)\r\n"
+    "1-0:22.7.0(00.000*kW)\r\n"
+    "0-1:24.1.0(003)\r\n"
+    "0-1:96.1.0(4730303538353330303437313231353230)\r\n"
+    "0-1:24.2.1(230104215500W)(00079.660*m3)\r\n"
+    "!3216\r\n";
+
+static const char test_identifier[] = "Ene5\\XS210 ESMR 5.0";
+
+typedef struct {
+    iec62056_obis_t obis;
+    const char **datasets;
+} test_telegram_input_t;
+
+static const test_telegram_input_t test_obis_output[] = {
+    { .obis = { 1, 3, 0, 2, 8, 255 }, .datasets = (const char *[]){ "50", NULL } },
+    { .obis = { 0, 0, 1, 0, 0, 255 }, .datasets = (const char *[]){ "230104215905W", NULL } },
+    { .obis = { 0, 0, 96, 1, 1, 255 },
+      .datasets = (const char *[]){ "4530303631303030303031313638373230", NULL } },
+    { .obis = { 1, 0, 1, 8, 1, 255 }, .datasets = (const char *[]){ "000233.793*kWh", NULL } },
+    { .obis = { 1, 0, 1, 8, 2, 255 }, .datasets = (const char *[]){ "000300.631*kWh", NULL } },
+    { .obis = { 1, 0, 2, 8, 1, 255 }, .datasets = (const char *[]){ "000000.043*kWh", NULL } },
+    { .obis = { 1, 0, 2, 8, 2, 255 }, .datasets = (const char *[]){ "000000.000*kWh", NULL } },
+    { .obis = { 0, 0, 96, 14, 0, 255 }, .datasets = (const char *[]){ "0002", NULL } },
+    { .obis = { 1, 0, 1, 7, 0, 255 }, .datasets = (const char *[]){ "00.416*kW", NULL } },
+    { .obis = { 1, 0, 2, 7, 0, 255 }, .datasets = (const char *[]){ "00.000*kW", NULL } },
+    { .obis = { 0, 0, 96, 7, 21, 255 }, .datasets = (const char *[]){ "00003", NULL } },
+    { .obis = { 0, 0, 96, 7, 9, 255 }, .datasets = (const char *[]){ "00001", NULL } },
+    { .obis = { 1, 0, 99, 97, 0, 255 }, .datasets = (const char *[]){ "0", "0-0:96.7.19", NULL } },
+    { .obis = { 1, 0, 32, 32, 0, 255 }, .datasets = (const char *[]){ "00001", NULL } },
+    { .obis = { 1, 0, 32, 36, 0, 255 }, .datasets = (const char *[]){ "00000", NULL } },
+    { .obis = { 0, 0, 96, 13, 0, 255 }, .datasets = (const char *[]){ "", NULL } },
+    { .obis = { 1, 0, 32, 7, 0, 255 }, .datasets = (const char *[]){ "237.0*V", NULL } },
+    { .obis = { 1, 0, 31, 7, 0, 255 }, .datasets = (const char *[]){ "001*A", NULL } },
+    { .obis = { 1, 0, 21, 7, 0, 255 }, .datasets = (const char *[]){ "00.416*kW", NULL } },
+    { .obis = { 1, 0, 22, 7, 0, 255 }, .datasets = (const char *[]){ "00.000*kW", NULL } },
+    { .obis = { 0, 1, 24, 1, 0, 255 }, .datasets = (const char *[]){ "003", NULL } },
+    { .obis = { 0, 1, 96, 1, 0, 255 },
+      .datasets = (const char *[]){ "4730303538353330303437313231353230", NULL } },
+    { .obis = { 0, 1, 24, 2, 1, 255 },
+      .datasets = (const char *[]){ "230104215500W", "00079.660*m3", NULL } },
+};
+
+static void _compare_obis(const iec62056_obis_t *a, const iec62056_obis_t *b)
+{
+    TEST_ASSERT_EQUAL_INT(0, memcmp(a, b, sizeof(iec62056_obis_t)));
+}
+
+static void _compare_dataset(const char *expected, const char *input, size_t len)
+{
+    TEST_ASSERT_NOT_NULL(expected);
+    TEST_ASSERT_EQUAL_INT(strlen(expected), len);
+    if (len) {
+        TEST_ASSERT_EQUAL_INT(0, memcmp(expected, input, len));
+    }
+}
+
+static int _test_telegram_callback(void *arg, const iec62056_21_dataset_t *dataset)
+{
+    size_t *index = arg;
+
+    if (iec62056_21_dataset_without_value(dataset)) {
+        *index += 1;
+        _compare_obis(&test_obis_output[*index].obis, &dataset->obis);
+    }
+    else {
+        const char *test_value = test_obis_output[*index].datasets[dataset->value_index];
+        _compare_dataset(test_value, dataset->value, dataset->value_length);
+    }
+    return 0;
+}
+
+static void test_iec62056_21_telegram(void)
+{
+    iec62056_21_parser_t parser;
+    size_t index = -1;
+
+    iec62056_21_parser_init(&parser, _test_telegram_callback, &index);
+    iec62056_21_parser_set_telegram(&parser, input_telegram, strlen(input_telegram));
+
+    const char *identifier = NULL;
+    ssize_t identifier_length = iec62056_21_get_header(&parser, &identifier);
+
+    TEST_ASSERT_EQUAL_INT(19, identifier_length);
+    TEST_ASSERT_EQUAL_INT(0, memcmp(identifier, test_identifier, identifier_length));
+
+    iec62056_21_parse_telegram(&parser);
+}
+
+Test *tests_iec62056(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_iec62056_obis),
+        new_TestFixture(test_iec62056_21_register),
+        new_TestFixture(test_iec62056_21_telegram),
+    };
+
+    EMB_UNIT_TESTCALLER(iec62056_tests, NULL, NULL, fixtures);
+    return (Test *)&iec62056_tests;
+}
+
+
+int main(void)
+{
+    TESTS_START();
+    TESTS_RUN(tests_iec62056());
+    TESTS_END();
+
+    return 0;
+}
diff --git a/tests/iec62056/tests/01-run.py b/tests/iec62056/tests/01-run.py
new file mode 100755
index 0000000000000..8cb603c3755f6
--- /dev/null
+++ b/tests/iec62056/tests/01-run.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2023 Koen Zandberg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    # put here the pexpect code that checks the output of the test application.
+    pass
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))