lib: lte_link_control: fix %NCELLMEAS notification parsing

Added handling for %NCELLMEAS notification with status 2 (measurement
interrupted), but no cells.

NRF91-2269

Signed-off-by: Tommi Kangas <[email protected]>

Author: tokangas

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -456,6 +456,10 @@ Modem libraries
 
   * Added the :c:func:`pdn_dynamic_params_get_v6` function to get PDN parameters for IPv6-only.
 
+* :ref:`lte_lc_readme` library:
+
+  * Fixed handling of ``%NCELLMEAS`` notification with status 2 (measurement interrupted) and no cells.
+
 Multiprotocol Service Layer libraries
 -------------------------------------
 

lib/lte_link_control/modules/ncellmeas.c

@@ -167,6 +167,10 @@ static int parse_ncellmeas_gci(struct lte_lc_ncellmeas_params *params, const cha
 		goto clean_exit;
 	} else if (status == AT_NCELLMEAS_STATUS_VALUE_INCOMPLETE) {
 		LOG_WRN("NCELLMEAS interrupted; results incomplete");
+		if (param_count == 3) {
+			/* No results, skip parsing. */
+			goto clean_exit;
+		}
 	}
 
 	/* Go through the cells */
@@ -425,6 +429,14 @@ static int parse_ncellmeas(const char *at_response, struct lte_lc_cells_info *ce
 	err = at_parser_init(&parser, at_response);
 	__ASSERT_NO_MSG(err == 0);
 
+	err = at_parser_cmd_count_get(&parser, &count);
+	if (err) {
+		LOG_ERR("Could not get NCELLMEAS param count, "
+			"potentially malformed notification, error: %d",
+			err);
+		goto clean_exit;
+	}
+
 	/* Status code */
 	err = at_parser_num_get(&parser, AT_NCELLMEAS_STATUS_INDEX, &status);
 	if (err) {
@@ -437,6 +449,10 @@ static int parse_ncellmeas(const char *at_response, struct lte_lc_cells_info *ce
 		goto clean_exit;
 	} else if (status == AT_NCELLMEAS_STATUS_VALUE_INCOMPLETE) {
 		LOG_WRN("NCELLMEAS interrupted; results incomplete");
+		if (count == 2) {
+			/* No results, skip parsing. */
+			goto clean_exit;
+		}
 	}
 
 	/* Current cell ID */
@@ -518,14 +534,6 @@ static int parse_ncellmeas(const char *at_response, struct lte_lc_cells_info *ce
 	size_t ta_meas_time_index = AT_NCELLMEAS_PRE_NCELLS_PARAMS_COUNT +
 				    cells->ncells_count * AT_NCELLMEAS_N_PARAMS_COUNT;
 
-	err = at_parser_cmd_count_get(&parser, &count);
-	if (err) {
-		LOG_ERR("Could not get NCELLMEAS param count, "
-			"potentially malformed notification, error: %d",
-			err);
-		goto clean_exit;
-	}
-
 	if (count > ta_meas_time_index) {
 		err = at_parser_num_get(&parser, ta_meas_time_index,
 					&cells->current_cell.timing_advance_meas_time);

tests/lib/lte_lc_api/src/lte_lc_api_test.c

@@ -2691,6 +2691,41 @@ void test_lte_lc_neighbor_cell_measurement_normal_status_incomplete(void)
 	at_monitor_dispatch(at_notif);
 }
 
+void test_lte_lc_neighbor_cell_measurement_normal_status_incomplete_no_cells(void)
+{
+	int ret;
+	struct lte_lc_ncellmeas_params params = {
+		.search_type = LTE_LC_NEIGHBOR_SEARCH_TYPE_DEFAULT,
+		.gci_count = 0,
+	};
+	strcpy(at_notif,
+	       "%NCELLMEAS: 2\r\n");
+
+	lte_lc_callback_count_expected = 1;
+
+	__mock_nrf_modem_at_printf_ExpectAndReturn("AT%NCELLMEAS", EXIT_SUCCESS);
+
+	ret = lte_lc_neighbor_cell_measurement(&params);
+	TEST_ASSERT_EQUAL(EXIT_SUCCESS, ret);
+
+	test_event_data[0].type = LTE_LC_EVT_NEIGHBOR_CELL_MEAS;
+	test_event_data[0].cells_info.current_cell.mcc = 0;
+	test_event_data[0].cells_info.current_cell.mnc = 0;
+	test_event_data[0].cells_info.current_cell.id = LTE_LC_CELL_EUTRAN_ID_INVALID;
+	test_event_data[0].cells_info.current_cell.tac = 0;
+	test_event_data[0].cells_info.current_cell.earfcn = 0;
+	test_event_data[0].cells_info.current_cell.timing_advance = 0;
+	test_event_data[0].cells_info.current_cell.timing_advance_meas_time = 0;
+	test_event_data[0].cells_info.current_cell.measurement_time = 0;
+	test_event_data[0].cells_info.current_cell.phys_cell_id = 0;
+	test_event_data[0].cells_info.current_cell.rsrp = 0;
+	test_event_data[0].cells_info.current_cell.rsrq = 0;
+	test_event_data[0].cells_info.ncells_count = 0;
+	test_event_data[0].cells_info.gci_cells_count = 0;
+
+	at_monitor_dispatch(at_notif);
+}
+
 void test_lte_lc_neighbor_cell_measurement_cell_id_missing_fail(void)
 {
 	int ret;
@@ -2955,6 +2990,41 @@ void test_lte_lc_neighbor_cell_measurement_gci_status_incomplete(void)
 	at_monitor_dispatch(at_notif);
 }
 
+void test_lte_lc_neighbor_cell_measurement_gci_status_incomplete_no_cells(void)
+{
+	int ret;
+	struct lte_lc_ncellmeas_params params = {
+		.search_type = LTE_LC_NEIGHBOR_SEARCH_TYPE_GCI_DEFAULT,
+		.gci_count = 2,
+	};
+	strcpy(at_notif,
+	       "%NCELLMEAS: 2\r\n");
+
+	lte_lc_callback_count_expected = 1;
+
+	__mock_nrf_modem_at_printf_ExpectAndReturn("AT%NCELLMEAS=3,2", EXIT_SUCCESS);
+
+	ret = lte_lc_neighbor_cell_measurement(&params);
+	TEST_ASSERT_EQUAL(EXIT_SUCCESS, ret);
+
+	test_event_data[0].type = LTE_LC_EVT_NEIGHBOR_CELL_MEAS;
+	test_event_data[0].cells_info.current_cell.mcc = 0;
+	test_event_data[0].cells_info.current_cell.mnc = 0;
+	test_event_data[0].cells_info.current_cell.id = LTE_LC_CELL_EUTRAN_ID_INVALID;
+	test_event_data[0].cells_info.current_cell.tac = 0;
+	test_event_data[0].cells_info.current_cell.earfcn = 0;
+	test_event_data[0].cells_info.current_cell.timing_advance = 0;
+	test_event_data[0].cells_info.current_cell.timing_advance_meas_time = 0;
+	test_event_data[0].cells_info.current_cell.measurement_time = 0;
+	test_event_data[0].cells_info.current_cell.phys_cell_id = 0;
+	test_event_data[0].cells_info.current_cell.rsrp = 0;
+	test_event_data[0].cells_info.current_cell.rsrq = 0;
+	test_event_data[0].cells_info.ncells_count = 0;
+	test_event_data[0].cells_info.gci_cells_count = 0;
+
+	at_monitor_dispatch(at_notif);
+}
+
 void test_lte_lc_neighbor_cell_measurement_gci_max_length(void)
 {
 	int ret;
@@ -3775,7 +3845,6 @@ void test_lte_lc_neighbor_cell_measurement_no_event_handler(void)
 	lte_lc_register_handler(lte_lc_event_handler);
 }
 
-
 void test_lte_lc_modem_sleep_event(void)
 {
 	lte_lc_callback_count_expected = 6;