mbed-os-examples / Mbed OS mbed-os-example-mbed5-wifi

A quick example of a simple WiFi application using the WiFi and network-socket APIs that is provided as a part of mbed-os.

The program brings up the WiFi and the underlying network interface, and uses it to scans available networks, connects to a network, prints interface and connection details and performs simple HTTP operation.

Supported hardware:

Not that the mbed target board the WiFi shield gets connected to shouldn't have any other network interface e.g. Ethernet.

ESP8266 is a fallback option and will be used if the build is for unsupported platform.

main.cpp@0:857719181846, 2016-10-26 (annotated)

Committer:
mbed_official
Date:
Wed Oct 26 12:00:05 2016 +0100
Revision:
0:857719181846
Child:
1:aea78e21a7da
Initial commit

Commit copied from https://github.com/ARMmbed/mbed-os-example-wifi

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:857719181846 1 /* WiFi Example
mbed_official 0:857719181846 2 * Copyright (c) 2016 ARM Limited
mbed_official 0:857719181846 3 *
mbed_official 0:857719181846 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 0:857719181846 5 * you may not use this file except in compliance with the License.
mbed_official 0:857719181846 6 * You may obtain a copy of the License at
mbed_official 0:857719181846 7 *
mbed_official 0:857719181846 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:857719181846 9 *
mbed_official 0:857719181846 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 0:857719181846 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 0:857719181846 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 0:857719181846 13 * See the License for the specific language governing permissions and
mbed_official 0:857719181846 14 * limitations under the License.
mbed_official 0:857719181846 15 */
mbed_official 0:857719181846 16
mbed_official 0:857719181846 17 #include "mbed.h"
mbed_official 0:857719181846 18 #include "TCPSocket.h"
mbed_official 0:857719181846 19
mbed_official 0:857719181846 20 #if TARGET_UBLOX_EVK_ODIN_W2
mbed_official 0:857719181846 21 #include "OdinWiFiInterface.h"
mbed_official 0:857719181846 22 OdinWiFiInterface wifi;
mbed_official 0:857719181846 23 #else
mbed_official 0:857719181846 24 #include "ESP8266Interface.h"
mbed_official 0:857719181846 25 ESP8266Interface wifi(D1, D0);
mbed_official 0:857719181846 26 #endif
mbed_official 0:857719181846 27
mbed_official 0:857719181846 28 const char *sec2str(nsapi_security_t sec)
mbed_official 0:857719181846 29 {
mbed_official 0:857719181846 30 switch (sec) {
mbed_official 0:857719181846 31 case NSAPI_SECURITY_NONE:
mbed_official 0:857719181846 32 return "None";
mbed_official 0:857719181846 33 case NSAPI_SECURITY_WEP:
mbed_official 0:857719181846 34 return "WEP";
mbed_official 0:857719181846 35 case NSAPI_SECURITY_WPA:
mbed_official 0:857719181846 36 return "WPA";
mbed_official 0:857719181846 37 case NSAPI_SECURITY_WPA2:
mbed_official 0:857719181846 38 return "WPA2";
mbed_official 0:857719181846 39 case NSAPI_SECURITY_WPA_WPA2:
mbed_official 0:857719181846 40 return "WPA/WPA2";
mbed_official 0:857719181846 41 case NSAPI_SECURITY_UNKNOWN:
mbed_official 0:857719181846 42 default:
mbed_official 0:857719181846 43 return "Unknown";
mbed_official 0:857719181846 44 }
mbed_official 0:857719181846 45 }
mbed_official 0:857719181846 46
mbed_official 0:857719181846 47 void scan_demo(WiFiInterface *wifi)
mbed_official 0:857719181846 48 {
mbed_official 0:857719181846 49 WiFiAccessPoint *ap;
mbed_official 0:857719181846 50
mbed_official 0:857719181846 51 printf("Scan:\r\n");
mbed_official 0:857719181846 52
mbed_official 0:857719181846 53 int count = wifi->scan(NULL,0);
mbed_official 0:857719181846 54
mbed_official 0:857719181846 55 /* Limit number of network arbitrary to 15 */
mbed_official 0:857719181846 56 count = count < 15 ? count : 15;
mbed_official 0:857719181846 57
mbed_official 0:857719181846 58 ap = new WiFiAccessPoint[count];
mbed_official 0:857719181846 59 count = wifi->scan(ap, count);
mbed_official 0:857719181846 60 for (int i = 0; i < count; i++)
mbed_official 0:857719181846 61 {
mbed_official 0:857719181846 62 printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\r\n", ap[i].get_ssid(),
mbed_official 0:857719181846 63 sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
mbed_official 0:857719181846 64 ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel());
mbed_official 0:857719181846 65 }
mbed_official 0:857719181846 66 printf("%d networks available.\r\n", count);
mbed_official 0:857719181846 67
mbed_official 0:857719181846 68 delete[] ap;
mbed_official 0:857719181846 69 }
mbed_official 0:857719181846 70
mbed_official 0:857719181846 71 void http_demo(NetworkInterface *net)
mbed_official 0:857719181846 72 {
mbed_official 0:857719181846 73 TCPSocket socket;
mbed_official 0:857719181846 74
mbed_official 0:857719181846 75 printf("Sending HTTP request to www.arm.com...\r\n");
mbed_official 0:857719181846 76
mbed_official 0:857719181846 77 // Open a socket on the network interface, and create a TCP connection to www.arm.com
mbed_official 0:857719181846 78 socket.open(net);
mbed_official 0:857719181846 79 socket.connect("www.arm.com", 80);
mbed_official 0:857719181846 80
mbed_official 0:857719181846 81 // Send a simple http request
mbed_official 0:857719181846 82 char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\r\n\r\n";
mbed_official 0:857719181846 83 int scount = socket.send(sbuffer, sizeof sbuffer);
mbed_official 0:857719181846 84 printf("sent %d [%.*s]\r\n", scount, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);
mbed_official 0:857719181846 85
mbed_official 0:857719181846 86 // Recieve a simple http response and print out the response line
mbed_official 0:857719181846 87 char rbuffer[64];
mbed_official 0:857719181846 88 int rcount = socket.recv(rbuffer, sizeof rbuffer);
mbed_official 0:857719181846 89 printf("recv %d [%.*s]\r\n", rcount, strstr(rbuffer, "\r\n")-rbuffer, rbuffer);
mbed_official 0:857719181846 90
mbed_official 0:857719181846 91 // Close the socket to return its memory and bring down the network interface
mbed_official 0:857719181846 92 socket.close();
mbed_official 0:857719181846 93 }
mbed_official 0:857719181846 94
mbed_official 0:857719181846 95 int main()
mbed_official 0:857719181846 96 {
mbed_official 0:857719181846 97 printf("WiFi example\r\n\r\n");
mbed_official 0:857719181846 98
mbed_official 0:857719181846 99 scan_demo(&wifi);
mbed_official 0:857719181846 100
mbed_official 0:857719181846 101 printf("\r\nConnecting...\r\n");
mbed_official 0:857719181846 102 int ret = wifi.connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
mbed_official 0:857719181846 103 if (ret != 0) {
mbed_official 0:857719181846 104 printf("\r\nConnection error\r\n");
mbed_official 0:857719181846 105 return -1;
mbed_official 0:857719181846 106 }
mbed_official 0:857719181846 107
mbed_official 0:857719181846 108 printf("Success\r\n\r\n");
mbed_official 0:857719181846 109 printf("MAC: %s\r\n", wifi.get_mac_address());
mbed_official 0:857719181846 110 printf("IP: %s\r\n", wifi.get_ip_address());
mbed_official 0:857719181846 111 printf("Netmask: %s\r\n", wifi.get_netmask());
mbed_official 0:857719181846 112 printf("Gateway: %s\r\n", wifi.get_gateway());
mbed_official 0:857719181846 113 printf("RSSI: %d\r\n\r\n", wifi.get_rssi());
mbed_official 0:857719181846 114
mbed_official 0:857719181846 115 http_demo(&wifi);
mbed_official 0:857719181846 116
mbed_official 0:857719181846 117 wifi.disconnect();
mbed_official 0:857719181846 118
mbed_official 0:857719181846 119 printf("\r\nDone\r\n");
mbed_official 0:857719181846 120 }