[nrf noup] samples: lwm2m_client: Add support for nRF91x and nRF700x

samples/net/lwm2m_client/overlay-nrf700x.conf

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+# General
+CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_ENTROPY_GENERATOR=y
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
+
+# Wi-Fi
+CONFIG_WIFI=y
+CONFIG_WIFI_NRF700X=y
+CONFIG_WIFI_MGMT_EXT=y
+CONFIG_NRF_WIFI_IF_AUTO_START=n
+
+# Credentials
+CONFIG_WIFI_CREDENTIALS=y
+CONFIG_WIFI_CREDENTIALS_STATIC=y
+CONFIG_WIFI_CREDENTIALS_STATIC_SSID=""
+CONFIG_WIFI_CREDENTIALS_STATIC_PASSWORD=""
+
+# WPA
+CONFIG_WPA_SUPP=y
+CONFIG_WPA_SUPP_LOG_LEVEL_ERR=y
+
+CONFIG_NET_NATIVE=y
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_UDP=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_OFFLOAD=n
+CONFIG_NET_BUF_RX_COUNT=18
+CONFIG_NET_BUF_TX_COUNT=18
+CONFIG_NET_DEFAULT_IF_WIFI=y
+
+# DNS
+CONFIG_DNS_RESOLVER=y
+
+# DHCPv4
+CONFIG_NET_DHCPV4=y
+CONFIG_NET_CONFIG_AUTO_INIT=n
+CONFIG_NET_CONFIG_NEED_IPV6=n
+CONFIG_NET_CONFIG_NEED_IPV4=n
+
+# Connection manager
+CONFIG_NET_CONNECTION_MANAGER=y
+
+# Zephyr NET Connection Manager Connectivity layer.
+CONFIG_L2_WIFI_CONNECTIVITY=y
+CONFIG_L2_WIFI_CONNECTIVITY_AUTO_DOWN=n
+CONFIG_L2_WIFI_CONNECTIVITY_AUTO_CONNECT=n
+
+CONFIG_LWM2M_APP_ID="nrf700x"
+CONFIG_LWM2M_APP_SERVER="coaps://leshan.eclipseprojects.io:5684"
+CONFIG_LWM2M_DNS_SUPPORT=y
+
+# Enable DTLS support
+CONFIG_LWM2M_DTLS_SUPPORT=y
+CONFIG_LWM2M_TLS_SESSION_CACHING=y
+
+# TLS networking
+CONFIG_NET_SOCKETS_ENABLE_DTLS=y
+CONFIG_NET_SOCKETS_TLS_MAX_CONTEXTS=4
+CONFIG_NET_SOCKETS_SOCKOPT_TLS=y
+
+# nRF Security
+CONFIG_NRF_SECURITY=y
+
+# mbedTLS
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_ENABLE_HEAP=y
+CONFIG_MBEDTLS_HEAP_SIZE=120000
+CONFIG_MBEDTLS_RSA_C=y

samples/net/lwm2m_client/overlay-nrf91x.conf

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+# Configuration file for nRF91x
+# This file is merged with prj.conf in the application folder, and options
+# set here will take precedence if they are present in both files.
+
+# General
+CONFIG_MAIN_STACK_SIZE=4096
+
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_NATIVE=y
+CONFIG_NET_SOCKETS_OFFLOAD=y
+
+CONFIG_NET_CONFIG_MY_IPV6_ADDR=""
+CONFIG_NET_CONFIG_PEER_IPV6_ADDR=""
+CONFIG_NET_CONFIG_MY_IPV4_ADDR=""
+CONFIG_NET_CONFIG_MY_IPV4_GW=""
+
+CONFIG_NET_CONFIG_NEED_IPV6=n
+CONFIG_NET_CONFIG_NEED_IPV4=n
+CONFIG_NET_CONFIG_AUTO_INIT=n
+
+# Modem related configurations
+CONFIG_NRF_MODEM_LIB_NET_IF=y
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_DOWN=n
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_CONNECT=n
+CONFIG_NRF_MODEM_LIB_NET_IF_AUTO_START=n
+CONFIG_NRF_MODEM_LIB_ON_FAULT_APPLICATION_SPECIFIC=y
+
+CONFIG_LTE_LINK_CONTROL_LOG_LEVEL_DBG=n
+CONFIG_NRF_MODEM_LIB_NET_IF_LOG_LEVEL_DBG=n
+
+# Disable Duplicate Address Detection (DAD)
+# due to not being properly implemented for offloaded interfaces.
+CONFIG_NET_IPV6_NBR_CACHE=n
+CONFIG_NET_IPV6_MLD=n
+
+# Zephyr NET Connection Manager and Connectivity layer.
+CONFIG_NET_CONNECTION_MANAGER=y
+CONFIG_NET_CONNECTION_MANAGER_MONITOR_STACK_SIZE=1024
+
+CONFIG_LWM2M_APP_ID="nrf91x"
+CONFIG_LWM2M_APP_SERVER="coaps://leshan.eclipseprojects.io:5684"
+CONFIG_LWM2M_DNS_SUPPORT=y
+
+## Enable DTLS support
+CONFIG_LWM2M_DTLS_SUPPORT=y
+CONFIG_LWM2M_TLS_SESSION_CACHING=y
+CONFIG_LWM2M_DTLS_CID=y
+CONFIG_TLS_CREDENTIALS=y
+
+## Crypto
+CONFIG_OBERON_BACKEND=y
+CONFIG_NORDIC_SECURITY_BACKEND=y
+CONFIG_MBEDTLS_SHA256_C=y