Embeint · JordanYates · Oct 6, 2025 · Oct 5, 2025 · Sep 19, 2025 · Sep 19, 2025
diff --git a/apps/gateway_lte/Kconfig b/apps/gateway_lte/Kconfig
@@ -6,13 +6,6 @@ config LTE_GATEWAY_DEFAULT_MAXIMUM_UPLINK_THROUGHPUT_KBPS
 	default 175 if SOC_SERIES_NRF91X
 	default 0
 
-# Shuffle memory to prioritise TX buffers
-configdefault NRF_MODEM_LIB_SHMEM_TX_SIZE
-	default 14336
-
-configdefault NRF_MODEM_LIB_SHMEM_RX_SIZE
-	default 8192
-
 #
 # Defaults for native nRF91 gateways
 #
@@ -26,5 +19,30 @@ configdefault LTE_PSM_REQ
 	default n
 configdefault INFUSE_NRF_MODEM_DATA_PROFILE_DEFAULT
 	default 4
+# Shuffle memory to prioritise TX buffers
+configdefault NRF_MODEM_LIB_SHMEM_TX_SIZE
+	default 14336
+configdefault NRF_MODEM_LIB_SHMEM_RX_SIZE
+	default 8192
+
+#
+# Defaults for offloaded modem_cellular gateways
+#
+configdefault BT_CTLR_SDC_PERIPHERAL_COUNT
+	default 2
+configdefault MODEM_CMUX_MTU
+	default 1500
+configdefault MODEM_CELLULAR_UART_BUFFER_SIZES
+	default 1500
+configdefault MODEM_CELLULAR_CHAT_BUFFER_SIZE
+	default 256
+configdefault MODEM_CELLULAR_USER_PIPE_BUFFER_SIZES
+	default 256
+# Huge impact on RAM consumption of the application
+# Limit it to 768, i.e. 2 buffers can contain our maximum packet size
+configdefault NET_BUF_DATA_SIZE
+	default 768 if !NRF_MODEM_LIB
+configdefault MODEM_PPP_NET_BUF_FRAG_SIZE
+	default 512
 
 source "Kconfig.zephyr"
diff --git a/apps/gateway_lte/sample.yaml b/apps/gateway_lte/sample.yaml
@@ -11,6 +11,7 @@ common:
     - ble
   integration_platforms:
     - auroch/nrf9151/ns
+    - kudu/nrf54l15/cpuapp
 tests:
   sample.app.gateway_lte:
     tags: gateway

diff --git a/apps/gateway_lte/src/main.c b/apps/gateway_lte/src/main.c
@@ -15,6 +15,7 @@
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/net_mgmt.h>
 #include <zephyr/net/conn_mgr_connectivity.h>
+#include <zephyr/pm/device_runtime.h>
 
 #include <infuse/auto/bluetooth_conn_log.h>
 #include <infuse/auto/time_sync_log.h>
@@ -261,6 +262,11 @@ int main(void)
 	epacket_receive(bt_adv, K_FOREVER);
 	epacket_receive(udp, K_FOREVER);
 
+#ifdef CONFIG_MODEM_CELLULAR
+	/* For now the Cellular Modem abstraction is not linked to a connection manager */
+	pm_device_runtime_get(DEVICE_DT_GET(DT_ALIAS(modem)));
+#endif /* CONFIG_MODEM_CELLULAR */
+
 	/* Turn on the interface */
 	conn_mgr_all_if_up(true);
 	conn_mgr_all_if_connect(true);

diff --git a/boards/embeint/kudu/Kconfig.defconfig b/boards/embeint/kudu/Kconfig.defconfig
@@ -6,4 +6,44 @@ if BOARD_KUDU_NRF54L15_CPUAPP
 configdefault ROM_START_OFFSET
 	default 0x800 if BOOTLOADER_MCUBOOT
 
+if NETWORKING
+
+# Constant latency to improve UART stability.
+# According to the datasheet this increases idle power consumption by 530 uA.
+# This is negligible compared to the consumption of the LTE CAT1 modem.
+configdefault NRF_FORCE_CONSTANT_LATENCY
+	default y
+configdefault NRFX_POWER
+	default y
+configdefault NRF_SYS_EVENT
+	default y
+
+# Pull-up resistor is missing for SIMDET to work
+choice MODEM_CELLULAR_SIM_DETECTION
+	default MODEM_CELLULAR_SIM_DETECTION_FORCE_PRESENT
+endchoice
+
+# Telit modem can in theory handle up to 3.75 Mbps.
+# While IP data appears to work fine at the high baudrate, for unknown
+# reasons the AT DLCI channels stop responding after some time. The higher
+# the baudrate, the sooner they stop responding.
+# 921600 appears to be stable for hours
+# 3500000 normally fails within a few minutes
+configdefault MODEM_CELLULAR_NEW_BAUDRATE
+	default 921600
+
+# We want to use the UART ASYNC API
+configdefault UART_ASYNC_API
+	default y
+configdefault UART_ASYNC_TX_CACHE_SIZE
+	default 64
+choice MODEM_BACKEND_UART_IMPL
+	default MODEM_BACKEND_UART_ASYNC_HWFC
+endchoice
+configdefault UART_00_NRF_TX_BUFFER_SIZE
+	default 256
+configdefault UART_00_INTERRUPT_DRIVEN
+	default n
+endif # NETWORKING
+
 endif # BOARD_KUDU_NRF54L15_CPUAPP
diff --git a/boards/embeint/kudu/kudu_cpuapp.yaml b/boards/embeint/kudu/kudu_cpuapp.yaml
@@ -20,3 +20,4 @@ supported:
   - retained_mem
   - spi
   - watchdog
+  - netif:modem
diff --git a/boards/embeint/kudu/kudu_cpuapp_common.dtsi b/boards/embeint/kudu/kudu_cpuapp_common.dtsi
@@ -55,6 +55,7 @@
 		fuel-gauge0 = &fuel_gauge;
 		environmental0 = &sht4x;
 		imu0 = &lsm6dsv;
+		modem = &telit_le910c1;
 	};
 };
 
@@ -124,6 +125,21 @@
 	status = "okay";
 };
 
+&uart00 {
+	status = "okay";
+	pinctrl-0 = <&uart00_default>;
+	pinctrl-1 = <&uart00_sleep>;
+	pinctrl-names = "default", "sleep";
+	current-speed = <115200>;
+	hw-flow-control;
+
+	telit_le910c1: telit_le910c1 {
+		compatible = "telit,le910cx";
+		mdm-power-gpios = <&gpio2 3 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
+		mdm-reset-gpios = <&gpio0 1 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
+	};
+};
+
 &spi20 {
 	status = "okay";
 	cs-gpios = <&gpio1 7 (GPIO_ACTIVE_LOW)>,

diff --git a/generated/Kconfig.kv_keys b/generated/Kconfig.kv_keys
@@ -81,37 +81,37 @@ config KV_STORE_KEY_EPACKET_UDP_PORT
 
 config KV_STORE_KEY_LTE_MODEM_MODEL
 	bool "Enable KV key LTE_MODEM_MODEL"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  Modem model as returned by AT+CGMM
 
 config KV_STORE_KEY_LTE_MODEM_FIRMWARE_REVISION
 	bool "Enable KV key LTE_MODEM_FIRMWARE_REVISION"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  Modem firmware revision as returned by AT+CGMR
 
 config KV_STORE_KEY_LTE_MODEM_ESN
 	bool "Enable KV key LTE_MODEM_ESN"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  'Electronic Serial Number' as returned by AT+CGSN=0
 
 config KV_STORE_KEY_LTE_MODEM_IMEI
 	bool "Enable KV key LTE_MODEM_IMEI"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  'International Modem Equiment Identifier' as returned by AT+CGSN=1
 
 config KV_STORE_KEY_LTE_SIM_UICC
 	bool "Enable KV key LTE_SIM_UICC"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  SIM Universal Identifier (https://www.itu.int/en/ITU-T/inr/forms/Pages/iin.aspx)
 
 config KV_STORE_KEY_LTE_PDP_CONFIG
 	bool "Enable KV key LTE_PDP_CONFIG"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  Packet Data Protocol (PDP) default context configuration
 
@@ -123,7 +123,7 @@ config KV_STORE_KEY_LTE_NETWORKING_MODES
 
 config KV_STORE_KEY_LTE_SIM_IMSI
 	bool "Enable KV key LTE_SIM_IMSI"
-	default y if NRF_MODEM_LIB
+	default y if NRF_MODEM_LIB || MODEM_CELLULAR
 	help
 	  'International Modem Subscriber Identity' as returned by AT+CIMI
 

diff --git a/generated/Kconfig.rpc_commands b/generated/Kconfig.rpc_commands
@@ -229,7 +229,7 @@ config INFUSE_RPC_COMMAND_HEAP_STATS_REQUIRED_AUTH
 
 config INFUSE_RPC_COMMAND_LTE_AT_CMD
 	bool "Enable RPC lte_at_cmd"
-	depends on NRF_MODEM_LIB
+	depends on NRF_MODEM_LIB || MODEM_CELLULAR
 	default y if INFUSE_SDK
 	help
 	  Run AT command against LTE modem
@@ -241,7 +241,7 @@ config INFUSE_RPC_COMMAND_LTE_AT_CMD_REQUIRED_AUTH
 
 config INFUSE_RPC_COMMAND_LTE_STATE
 	bool "Enable RPC lte_state"
-	depends on INFUSE_NRF_MODEM_MONITOR
+	depends on INFUSE_MODEM_MONITOR
 	default y if INFUSE_SDK
 	help
 	  Get current LTE interface state

diff --git a/generated/include/infuse/rpc/types.h b/generated/include/infuse/rpc/types.h
@@ -175,7 +175,7 @@ struct rpc_struct_wifi_state {
 struct rpc_struct_lte_state {
 	/** Network registration state */
 	uint8_t registration_state;
-	/** 0 = None, 7 = LTE-M, 9 = NB-IoT */
+	/** Access Technology (3GPP TS 127.007) */
 	uint8_t access_technology;
 	/** Mobile Country Code */
 	uint16_t mcc;

diff --git a/include/infuse/validation/cellular_modem.h b/include/infuse/validation/cellular_modem.h
@@ -0,0 +1,50 @@
+/**
+ * @file
+ * @copyright 2024 Embeint Holdings Pty Ltd
+ * @author Jordan Yates <[email protected]>
+ *
+ * SPDX-License-Identifier: FSL-1.1-ALv2
+ */
+
+#ifndef INFUSE_SDK_INCLUDE_INFUSE_VALIDATION_CELLULAR_MODEM_H_
+#define INFUSE_SDK_INCLUDE_INFUSE_VALIDATION_CELLULAR_MODEM_H_
+
+#include <zephyr/device.h>
+#include <zephyr/sys/util.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup validation_cellular_modem nRF modem validation API
+ * @{
+ */
+
+enum {
+	/** Check modem firmware version */
+	VALIDATION_CELLULAR_MODEM_FW_VERSION = 0,
+	/** Check SIM card found */
+	VALIDATION_CELLULAR_MODEM_SIM_CARD = BIT(0),
+};
+
+/**
+ * @brief Validate the behaviour of LTE modem
+ *
+ * @param dev Modem device
+ * @param flags Validation tests to run
+ *
+ * @retval 0 On success
+ * @retval -errno On failure
+ */
+int infuse_validation_cellular_modem(const struct device *dev, uint8_t flags);
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* INFUSE_SDK_INCLUDE_INFUSE_VALIDATION_CELLULAR_MODEM_H_ */
diff --git a/kconfig/Kconfig.defaults.net b/kconfig/Kconfig.defaults.net
@@ -7,6 +7,26 @@ if NETWORKING
 configdefault WIFI
 	default y if $(dt_chosen_enabled,$(DT_CHOSEN_Z_WIFI))
 
+# LTE Modem
+if $(dt_alias_enabled,modem)
+configdefault MODEM
+	default y
+configdefault MODEM_CELLULAR
+	default y
+configdefault MODEM_MODULES
+	default y
+configdefault MODEM_DEDICATED_WORKQUEUE
+	default y
+configdefault MODEM_AT_USER_PIPE
+	default y
+configdefault NET_DRIVERS
+	default y
+configdefault NET_L2_PPP
+	default y
+configdefault NET_L2_PPP_OPTION_DNS_USE
+	default y
+endif # $(dt_alias_enabled,modem)
+
 if WIFI
 
 # Reduce the default priority to prevent blocking other threads

diff --git a/lib/modem_monitor/CMakeLists.txt b/lib/modem_monitor/CMakeLists.txt
@@ -1,4 +1,5 @@
 # Modem library integration
 
 zephyr_sources(modem_monitor.c)
+add_subdirectory_ifdef(CONFIG_INFUSE_CELLULAR_MODEM_MONITOR modem_cellular)
 add_subdirectory_ifdef(CONFIG_INFUSE_NRF_MODEM_MONITOR modem_nrf9x)
diff --git a/lib/modem_monitor/Kconfig b/lib/modem_monitor/Kconfig
@@ -33,9 +33,15 @@ config INFUSE_MODEM_MONITOR_CONNECTIVITY_TIMEOUT_SEC
 	  being assigned to a PDP context other than 0, which the network stack
 	  integration fails to handle.
 
+# Disable the hardcoded APN from Zephyr by default
+configdefault MODEM_CELLULAR_APN
+	default ""
+
 config INFUSE_MODEM_MONITOR_DEFAULT_PDP_APN
 	string "Default APN to use for PDP context 0"
 	depends on KV_STORE_KEY_LTE_PDP_CONFIG
+	# internet is unlikely to be correct, but nothing is guaranteed to be incorrect
+	default "internet" if MODEM_CELLULAR
 	default ""
 	help
 	  The default APN to use for PDP context 0, if it has not been set to
@@ -49,6 +55,7 @@ config INFUSE_MODEM_MONITOR_DEFAULT_PDP_APN_SET
 choice INFUSE_MODEM_MONITOR_DEFAULT_PDP_FAMILY
 	prompt "Default protocol family to use for PDP context 0"
 	depends on INFUSE_MODEM_MONITOR_DEFAULT_PDP_APN_SET
+	default INFUSE_MODEM_MONITOR_DEFAULT_PDP_FAMILY_IPV4 if MODEM_CELLULAR
 	default INFUSE_MODEM_MONITOR_DEFAULT_PDP_FAMILY_IPV4V6
 
 config INFUSE_MODEM_MONITOR_DEFAULT_PDP_FAMILY_IPV4
@@ -67,4 +74,5 @@ endchoice
 
 endif # INFUSE_MODEM_MONITOR
 
+rsource "modem_cellular/Kconfig"
 rsource "modem_nrf9x/Kconfig"
diff --git a/lib/modem_monitor/modem_cellular/CMakeLists.txt b/lib/modem_monitor/modem_cellular/CMakeLists.txt
@@ -0,0 +1,3 @@
+# LTE modem library integration
+
+zephyr_sources(cellular_modem_monitor.c)
diff --git a/lib/modem_monitor/modem_cellular/Kconfig b/lib/modem_monitor/modem_cellular/Kconfig
@@ -0,0 +1,10 @@
+# Cellular Modem monitor configuration
+
+config INFUSE_CELLULAR_MODEM_MONITOR
+	bool "Infuse-IoT integration with Cellular Modems"
+	depends on KV_STORE
+	depends on MODEM_CELLULAR
+	select MODEM_CELLULAR_SUSPEND_ASYNC
+	select INFUSE_MODEM_MONITOR
+	select INFUSE_WORKQ
+	default y
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		# LTE modem library integration

		zephyr_sources(cellular_modem_monitor.c)