samples: net: sockets: echo: Add WiFi support

Modify the sample application to connect to a WiFi access
point, if configured.  Kconfig options are provided to
specify the SSID and password.  Configuration file is
included for the Raspberry Pi Pico W.

Signed-off-by: Steve Boylan <[email protected]>

samples/net/sockets/echo/Kconfig

@@ -0,0 +1,16 @@
+#  Copyright (c) 2024 Steve Boylan <[email protected]>
+#  SPDX-License-Identifier: Apache-2.0
+
+mainmenu "Sample app Configuration"
+
+if WIFI
+config NET_SAMPLE_WIFI_SSID
+	string "WIFI SSID - Network name"
+	default "my_network"
+
+config NET_SAMPLE_WIFI_PSK
+	string "WIFI PSK - Network password key"
+	default "secret_passwd"
+endif
+
+source "Kconfig.zephyr"

samples/net/sockets/echo/README.rst

@@ -83,3 +83,16 @@ the IP address will be printed to the console upon running this echo
 application.
 
 Proceed to test as above.
+
+Running on Raspberry Pi Pico W
+==============================
+
+Edit boards/rpi_pico_rp2040_w.conf to add the Access Point SSID and password
+at the end:
+
+.. code-block:: cfg
+
+    CONFIG_NET_SAMPLE_WIFI_SSID="MyWifi"
+    CONFIG_NET_SAMPLE_WIFI_PSK="SuperSecret"
+
+Build and test as above.

samples/net/sockets/echo/boards/rpi_pico_rp2040_w.conf

@@ -0,0 +1,49 @@
+CONFIG_EARLY_CONSOLE=y
+
+CONFIG_MAIN_STACK_SIZE=5200
+CONFIG_SHELL_STACK_SIZE=5200
+CONFIG_NET_TX_STACK_SIZE=2048
+CONFIG_NET_RX_STACK_SIZE=2048
+CONFIG_HEAP_MEM_POOL_SIZE=16384
+CONFIG_SHELL_STACK_SIZE=2560
+
+CONFIG_WIFI=y
+CONFIG_WIFI_LOG_LEVEL_ERR=y
+CONFIG_NET_L2_WIFI_SHELL=y
+# printing of scan results puts pressure on queues in new locking
+# design in net_mgmt. So, use a higher timeout for a crowded
+# environment.
+CONFIG_NET_MGMT_EVENT_QUEUE_TIMEOUT=5000
+CONFIG_NET_MGMT_EVENT_QUEUE_SIZE=16
+
+CONFIG_NETWORKING=y
+CONFIG_NET_L2_ETHERNET=y
+
+CONFIG_NET_IPV6=n
+CONFIG_NET_IPV4=y
+CONFIG_NET_DHCPV4=y
+CONFIG_NET_CONFIG_MY_IPV4_ADDR=""
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR=""
+
+CONFIG_NET_LOG=y
+CONFIG_INIT_STACKS=y
+
+CONFIG_NET_SHELL=y
+
+CONFIG_NET_STATISTICS=y
+CONFIG_NET_STATISTICS_PERIODIC_OUTPUT=n
+
+CONFIG_COMPILER_SAVE_TEMPS=y
+
+CONFIG_LOG=y
+CONFIG_LOG_MODE_IMMEDIATE=y
+CONFIG_LOG_BACKEND_SHOW_COLOR=n
+
+CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y
+CONFIG_NET_CONN_LOG_LEVEL_DBG=y
+CONFIG_NET_CONTEXT_LOG_LEVEL_DBG=y
+
+CONFIG_NET_TCP_LOG_LEVEL_DBG=y
+
+CONFIG_NET_SAMPLE_WIFI_SSID="<YOUR SSID HERE>"
+CONFIG_NET_SAMPLE_WIFI_PSK="<YOUR WIFI PASSWORD HERE>"

samples/net/sockets/echo/src/socket_echo.c

@@ -19,6 +19,14 @@
 
 #include <zephyr/net/socket.h>
 #include <zephyr/kernel.h>
+#include <zephyr/net/net_mgmt.h>
+
+#ifdef CONFIG_NET_L2_WIFI_MGMT
+#include <zephyr/net/wifi_mgmt.h>
+#endif /* CONFIG_NET_L2_WIFI_MGMT */
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(socket_echo);
 
 #endif
 
@@ -36,6 +44,34 @@ int main(void)
 	};
 	static int counter;
 
+#if defined(CONFIG_WIFI)
+	int nr_tries = 10;
+	struct net_if *iface = net_if_get_default();
+	static struct wifi_connect_req_params cnx_params = {
+		.ssid = CONFIG_NET_SAMPLE_WIFI_SSID,
+		.ssid_length = 0,
+		.psk = CONFIG_NET_SAMPLE_WIFI_PSK,
+		.psk_length = 0,
+		.channel = 0,
+		.security = WIFI_SECURITY_TYPE_PSK,
+	};
+
+	cnx_params.ssid_length = strlen(CONFIG_NET_SAMPLE_WIFI_SSID);
+	cnx_params.psk_length = strlen(CONFIG_NET_SAMPLE_WIFI_PSK);
+
+	/* Let's wait few seconds to allow wifi device be on-line */
+	while (nr_tries-- > 0) {
+		ret = net_mgmt(NET_REQUEST_WIFI_CONNECT, iface, &cnx_params,
+			       sizeof(struct wifi_connect_req_params));
+		if (ret == 0) {
+			break;
+		}
+
+		LOG_INF("Connect request failed %d. Waiting iface be up...", ret);
+		k_msleep(500);
+	}
+#endif
+
 	serv = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 	if (serv < 0) {
 		printf("error: socket: %d\n", errno);