WiFi example for mbed OS, fork from https://github.com/ARMmbed/mbed-os-example-wifi
This is an example of a Wi-Fi application using the Wi-Fi and network socket APIs that Mbed OS provides.
The program brings up the Wi-Fi and the underlying network interface and uses it to scan available networks, connects to a network, prints interface and connection details and performs an HTTP operation.
For more information about Wi-Fi APIs, please visit the Mbed OS Wi-Fi documentation.
This example has been used on the following platforms
Diff: main.cpp
- Revision:
- 0:0593b97dec0b
- Child:
- 1:67275d54581f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Thu Feb 22 05:44:51 2018 +0000 @@ -0,0 +1,170 @@ +/* WiFi Example + * Copyright (c) 2016 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "mbed.h" +#include "TCPSocket.h" + +#define WIFI_ESP8266 1 +#define WIFI_IDW0XX1 2 +#define WIFI_ESP32 3 + +#if TARGET_UBLOX_EVK_ODIN_W2 +#include "OdinWiFiInterface.h" +OdinWiFiInterface wifi; + +#elif TARGET_REALTEK_RTL8195AM +#include "RTWInterface.h" +RTWInterface wifi; + +#else // External WiFi modules + +#if MBED_CONF_APP_WIFI_SHIELD == WIFI_ESP8266 +#include "ESP8266Interface.h" +ESP8266Interface wifi(MBED_CONF_APP_WIFI_TX, MBED_CONF_APP_WIFI_RX); +#elif MBED_CONF_APP_WIFI_SHIELD == WIFI_IDW0XX1 +#include "SpwfSAInterface.h" +SpwfSAInterface wifi(MBED_CONF_APP_WIFI_TX, MBED_CONF_APP_WIFI_RX); +#elif MBED_CONF_APP_WIFI_SHIELD == WIFI_ESP32 +#include "ESP32Interface.h" +ESP32Interface wifi(MBED_CONF_APP_WIFI_EN, MBED_CONF_APP_WIFI_IO0, MBED_CONF_APP_WIFI_TX, MBED_CONF_APP_WIFI_RX); +#endif + +#endif + +const char *sec2str(nsapi_security_t sec) +{ + switch (sec) { + case NSAPI_SECURITY_NONE: + return "None"; + case NSAPI_SECURITY_WEP: + return "WEP"; + case NSAPI_SECURITY_WPA: + return "WPA"; + case NSAPI_SECURITY_WPA2: + return "WPA2"; + case NSAPI_SECURITY_WPA_WPA2: + return "WPA/WPA2"; + case NSAPI_SECURITY_UNKNOWN: + default: + return "Unknown"; + } +} + +int scan_demo(WiFiInterface *wifi) +{ + WiFiAccessPoint *ap; + + printf("Scan:\n"); + + int count = wifi->scan(NULL,0); + + /* Limit number of network arbitrary to 15 */ + count = count < 15 ? count : 15; + + ap = new WiFiAccessPoint[count]; + count = wifi->scan(ap, count); + for (int i = 0; i < count; i++) + { + printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\n", ap[i].get_ssid(), + sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2], + ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel()); + } + printf("%d networks available.\n", count); + + delete[] ap; + return count; +} + +void http_demo(NetworkInterface *net) +{ + TCPSocket socket; + nsapi_error_t response; + + printf("Sending HTTP request to www.arm.com...\n"); + + // Open a socket on the network interface, and create a TCP connection to www.arm.com + socket.open(net); + + response = socket.connect("www.arm.com", 80); + if(0 != response) { + printf("Error connecting: %d\n", response); + socket.close(); + return; + } + + // Send a simple http request + char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\r\n\r\n"; + nsapi_size_t size = strlen(sbuffer); + response = 0; + while(size) + { + response = socket.send(sbuffer+response, size); + if (response < 0) { + printf("Error sending data: %d\n", response); + socket.close(); + return; + } else { + size -= response; + // Check if entire message was sent or not + printf("sent %d [%.*s]\n", response, strstr(sbuffer, "\r\n")-sbuffer, sbuffer); + } + } + + // Recieve a simple http response and print out the response line + char rbuffer[64]; + response = socket.recv(rbuffer, sizeof rbuffer); + if (response < 0) { + printf("Error receiving data: %d\n", response); + } else { + printf("recv %d [%.*s]\n", response, strstr(rbuffer, "\r\n")-rbuffer, rbuffer); + } + + // Close the socket to return its memory and bring down the network interface + socket.close(); +} + +int main() +{ + int count = 0; + + printf("WiFi example\n\n"); + + count = scan_demo(&wifi); + if (count == 0) { + printf("No WIFI APNs found - can't continue further.\n"); + return -1; + } + + printf("\nConnecting to %s...\n", MBED_CONF_APP_WIFI_SSID); + int ret = wifi.connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2); + if (ret != 0) { + printf("\nConnection error\n"); + return -1; + } + + printf("Success\n\n"); + printf("MAC: %s\n", wifi.get_mac_address()); + printf("IP: %s\n", wifi.get_ip_address()); + printf("Netmask: %s\n", wifi.get_netmask()); + printf("Gateway: %s\n", wifi.get_gateway()); + printf("RSSI: %d\n\n", wifi.get_rssi()); + + http_demo(&wifi); + + wifi.disconnect(); + + printf("\nDone\n"); +}