examples: zephyr: location: add nRF91 support

Add nRF91 specific cellular tower information fetching and use when requesting location data. Use current cell only for now, as that is the only information provided with the tested modem and SIM card. Leave logs for neighbour cells enabled, so that extending this sample in the future is easy. Signed-off-by: Marcin Niestroj <[email protected]>
golioth · Jan 21, 2025 · 3b33bd3 · 3b33bd3
1 parent 53bce5e
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diff --git a/examples/zephyr/location/CMakeLists.txt b/examples/zephyr/location/CMakeLists.txt
@@ -8,3 +8,4 @@ project(location)
 target_sources(app PRIVATE src/main.c)
 target_sources_ifdef(CONFIG_GOLIOTH_CELLULAR_PLAYBACK app PRIVATE src/cellular_playback.c)
 target_sources_ifdef(CONFIG_GOLIOTH_WIFI_PLAYBACK app PRIVATE src/wifi_playback.c)
+target_sources_ifdef(CONFIG_SOC_SERIES_NRF91X app PRIVATE src/cellular_nrf91.c)
diff --git a/examples/zephyr/location/Kconfig b/examples/zephyr/location/Kconfig
@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 configdefault GOLIOTH_LOCATION_CELLULAR
+    default y if SOC_SERIES_NRF91X
     default y if GOLIOTH_CELLULAR_PLAYBACK
 
 configdefault GOLIOTH_LOCATION_WIFI

diff --git a/examples/zephyr/location/README.md b/examples/zephyr/location/README.md
@@ -172,6 +172,16 @@ $ west build -b nrf52840dk/nrf52840 examples/zephyr/location
 $ west flash
 ```
 
+#### nRF9160 DK
+
+On your host computer open a terminal window, locate the source code of
+this sample application (i.e., `examples/zephyr/location`) and type:
+
+```console
+$ west build -b nrf9160dk/nrf9160/ns examples/zephyr/location
+$ west flash
+```
+
 ### Sample output
 
 This is the output from the serial console:

diff --git a/examples/zephyr/location/sample.yaml b/examples/zephyr/location/sample.yaml
@@ -14,6 +14,8 @@ tests:
       - native_sim
       - native_sim/native/64
       - nrf52840dk/nrf52840
+      - nrf9151dk/nrf9151/ns
+      - nrf9160dk/nrf9160/ns
   sample.golioth.location.wifi_only:
     extra_configs:
       - CONFIG_GOLIOTH_CELLULAR_PLAYBACK=n

diff --git a/examples/zephyr/location/socs/nrf9151_ns.conf b/examples/zephyr/location/socs/nrf9151_ns.conf
@@ -0,0 +1,41 @@
+# General config
+CONFIG_HEAP_MEM_POOL_SIZE=4096
+CONFIG_NEWLIB_LIBC=y
+
+# Networking
+CONFIG_NET_SOCKETS_OFFLOAD=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_IPV6_NBR_CACHE=n
+CONFIG_NET_IPV6_MLD=n
+
+# Increase native TLS socket implementation, so that it is chosen instead of
+# offloaded nRF91 sockets
+CONFIG_NET_SOCKETS_TLS_PRIORITY=35
+
+# Modem library
+CONFIG_NRF_MODEM_LIB=y
+
+# LTE connectivity with network connection manager
+CONFIG_NRF_MODEM_LIB_NET_IF=y
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_START=y
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_CONNECT=y
+CONFIG_NET_CONNECTION_MANAGER=y
+CONFIG_NET_CONNECTION_MANAGER_MONITOR_STACK_SIZE=1024
+
+# Increased sysworkq size, due to LTE connectivity
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
+
+# Disable options y-selected by NCS for no good reason
+CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED=n
+CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED=n
+
+# MbedTLS configuration to support p-384 curve. These options
+# enable using the MbedTLS built-in support for operations not
+# supported by the default nRF Oberon crypto backend
+CONFIG_NORDIC_SECURITY_BACKEND=n
+CONFIG_MBEDTLS_LEGACY_CRYPTO_C=y
+
+# Generate MCUboot compatible images
+CONFIG_BOOTLOADER_MCUBOOT=y
+
+CONFIG_LTE_LC_NEIGHBOR_CELL_MEAS_MODULE=y
diff --git a/examples/zephyr/location/socs/nrf9160_ns.conf b/examples/zephyr/location/socs/nrf9160_ns.conf
@@ -0,0 +1,38 @@
+# General config
+CONFIG_HEAP_MEM_POOL_SIZE=4096
+CONFIG_NEWLIB_LIBC=y
+
+# Networking
+CONFIG_NET_SOCKETS_OFFLOAD=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_IPV6_NBR_CACHE=n
+CONFIG_NET_IPV6_MLD=n
+
+# Increase native TLS socket implementation, so that it is chosen instead of
+# offloaded nRF91 sockets
+CONFIG_NET_SOCKETS_TLS_PRIORITY=35
+
+# Modem library
+CONFIG_NRF_MODEM_LIB=y
+
+# LTE connectivity with network connection manager
+CONFIG_NRF_MODEM_LIB_NET_IF=y
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_START=y
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_CONNECT=y
+CONFIG_NET_CONNECTION_MANAGER=y
+CONFIG_NET_CONNECTION_MANAGER_MONITOR_STACK_SIZE=1024
+
+# Increased sysworkq size, due to LTE connectivity
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
+
+# Disable options y-selected by NCS for no good reason
+CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED=n
+CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED=n
+
+# MbedTLS configuration to support p-384 curve. These options
+# enable using the MbedTLS built-in support for operations not
+# supported by the default nRF Oberon crypto backend
+CONFIG_NORDIC_SECURITY_BACKEND=n
+CONFIG_MBEDTLS_LEGACY_CRYPTO_C=y
+
+CONFIG_LTE_LC_NEIGHBOR_CELL_MEAS_MODULE=y
diff --git a/examples/zephyr/location/src/cellular_nrf91.c b/examples/zephyr/location/src/cellular_nrf91.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2025 Golioth, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(cellular_nrf91);
+
+#include <modem/lte_lc.h>
+
+#include "cellular.h"
+
+/* Indicates when individual ncellmeas operation is completed. This is internal to this file. */
+static K_SEM_DEFINE(scan_cellular_sem_ncellmeas_evt, 0, 1);
+
+static enum lte_lc_lte_mode lte_mode;
+static struct lte_lc_ncell neighbor_cells[CONFIG_LTE_NEIGHBOR_CELLS_MAX];
+static struct lte_lc_cells_info scan_cellular_info = {
+    .neighbor_cells = neighbor_cells,
+};
+
+static const char *lte_mode_to_str(enum lte_lc_lte_mode mode)
+{
+    switch (mode)
+    {
+        case LTE_LC_LTE_MODE_LTEM:
+            return "LTEM";
+        case LTE_LC_LTE_MODE_NBIOT:
+            return "NBIOT";
+        case LTE_LC_LTE_MODE_NONE:
+            return "NONE";
+    }
+
+    return "unknown";
+}
+
+static void lte_ind_handler(const struct lte_lc_evt *const evt)
+{
+    switch (evt->type)
+    {
+        case LTE_LC_EVT_LTE_MODE_UPDATE:
+            LOG_INF("LTE mode: %s", lte_mode_to_str(evt->lte_mode));
+            lte_mode = evt->lte_mode;
+            break;
+        case LTE_LC_EVT_CELL_UPDATE:
+            LOG_INF("LTE cell changed: Cell ID: %d, Tracking area: %d",
+                    evt->cell.id,
+                    evt->cell.tac);
+            break;
+        case LTE_LC_EVT_NEIGHBOR_CELL_MEAS:
+            LOG_INF("LTE current cell: MCC %d, MNC %d, Cell ID: %d, Tracking area: %d",
+                    evt->cells_info.current_cell.mcc,
+                    evt->cells_info.current_cell.mnc,
+                    evt->cells_info.current_cell.id,
+                    evt->cells_info.current_cell.tac);
+
+            LOG_INF(
+                "Cell measurements results received: "
+                "ncells_count=%d, gci_cells_count=%d, current_cell.id=0x%08X",
+                evt->cells_info.ncells_count,
+                evt->cells_info.gci_cells_count,
+                evt->cells_info.current_cell.id);
+
+            if (evt->cells_info.current_cell.id != LTE_LC_CELL_EUTRAN_ID_INVALID)
+            {
+                /* Copy current cell information. We are seeing this is not set for GCI
+                 * search sometimes but we have it for the previous normal neighbor search.
+                 */
+                memcpy(&scan_cellular_info.current_cell,
+                       &evt->cells_info.current_cell,
+                       sizeof(struct lte_lc_cell));
+            }
+
+            /* Copy neighbor cell information if present */
+            if (evt->cells_info.ncells_count > 0 && evt->cells_info.neighbor_cells)
+            {
+                memcpy(scan_cellular_info.neighbor_cells,
+                       evt->cells_info.neighbor_cells,
+                       sizeof(struct lte_lc_ncell) * evt->cells_info.ncells_count);
+
+                scan_cellular_info.ncells_count = evt->cells_info.ncells_count;
+            }
+            else
+            {
+                LOG_DBG("No neighbor cell information from modem");
+            }
+
+            /* Copy surrounding cell information if present */
+            if (evt->cells_info.gci_cells_count > 0 && evt->cells_info.gci_cells)
+            {
+                memcpy(scan_cellular_info.gci_cells,
+                       evt->cells_info.gci_cells,
+                       sizeof(struct lte_lc_cell) * evt->cells_info.gci_cells_count);
+
+                scan_cellular_info.gci_cells_count = evt->cells_info.gci_cells_count;
+            }
+            else
+            {
+                LOG_DBG("No surrounding cell information from modem");
+            }
+
+            k_sem_give(&scan_cellular_sem_ncellmeas_evt);
+            break;
+
+        default:
+            break;
+    }
+}
+
+int cellular_info_get(struct golioth_cellular_info *infos,
+                      size_t num_max_infos,
+                      size_t *num_returned_infos)
+{
+    struct lte_lc_ncellmeas_params params = {
+        .search_type = LTE_LC_NEIGHBOR_SEARCH_TYPE_EXTENDED_LIGHT,
+    };
+    struct lte_lc_cell *current = &scan_cellular_info.current_cell;
+    int err;
+
+    err = lte_lc_neighbor_cell_measurement(&params);
+    if (err)
+    {
+        return err;
+    }
+
+    err = k_sem_take(&scan_cellular_sem_ncellmeas_evt, K_FOREVER);
+    if (err)
+    {
+        /* Semaphore was reset so stop search procedure */
+        err = 0;
+    }
+
+    switch (lte_mode)
+    {
+        case LTE_LC_LTE_MODE_LTEM:
+            infos[0].type = GOLIOTH_CELLULAR_TYPE_LTECATM;
+            break;
+        case LTE_LC_LTE_MODE_NBIOT:
+            infos[0].type = GOLIOTH_CELLULAR_TYPE_NBIOT;
+            break;
+        default:
+            *num_returned_infos = 0;
+            return 0;
+    }
+
+    infos[0].mcc = current->mcc;
+    infos[0].mnc = current->mnc;
+    infos[0].id = current->id;
+
+    *num_returned_infos = 1;
+
+    return 0;
+}
+
+static int cellular_nrf91_init(void)
+{
+    lte_lc_register_handler(lte_ind_handler);
+
+    return 0;
+}
+
+SYS_INIT(cellular_nrf91_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);