console: re-use the available REPL console API and improve linenoise

Console example doesn't duplicate code in `console` component.
Linenoise has been improved: it now has a parametrized command line
length. It is now possible to paste data efficiently to the console.
Note: this can only be done if the cursor is at the end of the line.

Closes https://github.com/espressif/esp-idf/issues/7057

examples/system/console/basic/main/cmd_wifi.c

@@ -0,0 +1,132 @@
+/* Console example — WiFi commands
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include "esp_log.h"
+#include "esp_console.h"
+#include "argtable3/argtable3.h"
+#include "cmd_decl.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "esp_wifi.h"
+#include "esp_netif.h"
+#include "esp_event.h"
+#include "cmd_wifi.h"
+
+#define JOIN_TIMEOUT_MS (10000)
+
+static EventGroupHandle_t wifi_event_group;
+const int CONNECTED_BIT = BIT0;
+
+
+static void event_handler(void* arg, esp_event_base_t event_base,
+                                int32_t event_id, void* event_data)
+{
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        esp_wifi_connect();
+        xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
+    }
+}
+
+static void initialise_wifi(void)
+{
+    esp_log_level_set("wifi", ESP_LOG_WARN);
+    static bool initialized = false;
+    if (initialized) {
+        return;
+    }
+    ESP_ERROR_CHECK(esp_netif_init());
+    wifi_event_group = xEventGroupCreate();
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_t *ap_netif = esp_netif_create_default_wifi_ap();
+    assert(ap_netif);
+    esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
+    assert(sta_netif);
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
+    ESP_ERROR_CHECK( esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &event_handler, NULL) );
+    ESP_ERROR_CHECK( esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL) );
+    ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
+    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_NULL) );
+    ESP_ERROR_CHECK( esp_wifi_start() );
+    initialized = true;
+}
+
+static bool wifi_join(const char *ssid, const char *pass, int timeout_ms)
+{
+    initialise_wifi();
+    wifi_config_t wifi_config = { 0 };
+    strlcpy((char *) wifi_config.sta.ssid, ssid, sizeof(wifi_config.sta.ssid));
+    if (pass) {
+        strlcpy((char *) wifi_config.sta.password, pass, sizeof(wifi_config.sta.password));
+    }
+
+    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+    esp_wifi_connect();
+
+    int bits = xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
+                                   pdFALSE, pdTRUE, timeout_ms / portTICK_PERIOD_MS);
+    return (bits & CONNECTED_BIT) != 0;
+}
+
+/** Arguments used by 'join' function */
+static struct {
+    struct arg_int *timeout;
+    struct arg_str *ssid;
+    struct arg_str *password;
+    struct arg_end *end;
+} join_args;
+
+static int connect(int argc, char **argv)
+{
+    int nerrors = arg_parse(argc, argv, (void **) &join_args);
+    if (nerrors != 0) {
+        arg_print_errors(stderr, join_args.end, argv[0]);
+        return 1;
+    }
+    ESP_LOGI(__func__, "Connecting to '%s'",
+             join_args.ssid->sval[0]);
+
+    /* set default value*/
+    if (join_args.timeout->count == 0) {
+        join_args.timeout->ival[0] = JOIN_TIMEOUT_MS;
+    }
+
+    bool connected = wifi_join(join_args.ssid->sval[0],
+                               join_args.password->sval[0],
+                               join_args.timeout->ival[0]);
+    if (!connected) {
+        ESP_LOGW(__func__, "Connection timed out");
+        return 1;
+    }
+    ESP_LOGI(__func__, "Connected");
+    return 0;
+}
+
+void register_wifi(void)
+{
+    join_args.timeout = arg_int0(NULL, "timeout", "<t>", "Connection timeout, ms");
+    join_args.ssid = arg_str1(NULL, NULL, "<ssid>", "SSID of AP");
+    join_args.password = arg_str0(NULL, NULL, "<pass>", "PSK of AP");
+    join_args.end = arg_end(2);
+
+    const esp_console_cmd_t join_cmd = {
+        .command = "join",
+        .help = "Join WiFi AP as a station",
+        .hint = NULL,
+        .func = &connect,
+        .argtable = &join_args
+    };
+
+    ESP_ERROR_CHECK( esp_console_cmd_register(&join_cmd) );
+}