# mbed-os-example-wifi #
Wi-Fi example for Mbed OS
## Getting started with the Wi-Fi API ##
This is an example of a Wi-Fi application using the Wi-Fi and network socket APIs that [Mbed OS](https://github.com/ARMmbed/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](https://os.mbed.com/docs/latest/reference/wi-fi.html) documentation.
### Supported hardware ###
* [u-blox Odin board](https://os.mbed.com/platforms/ublox-EVK-ODIN-W2/) built-in Wi-Fi module.
* [Realtek RTL8195AM](https://os.mbed.com/platforms/REALTEK-RTL8195AM/) built-in Wi-Fi module.
* [NUCLEO-F401RE](https://os.mbed.com/platforms/ST-Nucleo-F401RE/) with [X-NUCLEO-IDW04A1](http://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-boards/stm32-ode-connect-hw/x-nucleo-idw04a1.html) Wi-Fi expansion board using pins D8 and D2 _(of the Arduino connector)_.
* [NUCLEO-F401RE](https://os.mbed.com/platforms/ST-Nucleo-F401RE/) with [X-NUCLEO-IDW01M1](https://os.mbed.com/components/X-NUCLEO-IDW01M1/) Wi-Fi expansion board using pins PA_9 and PA_10 _(of the Morpho connector)_.
* [NUCLEO-F429ZI](https://os.mbed.com/platforms/ST-Nucleo-F429ZI/) with ESP8266-01 module using pins D1 and D0.
* [NUCLEO-L476RG](https://os.mbed.com/platforms/ST-Nucleo-L476RG/) with ESP8266-01 module using pins D8 and D2.
* Other Mbed targets with an ESP8266 module, [X-NUCLEO-IDW04A1](http://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-boards/stm32-ode-connect-hw/x-nucleo-idw04a1.html) or [X-NUCLEO-IDW01M1](https://os.mbed.com/components/X-NUCLEO-IDW01M1/) expansion board.
  *(The Mbed target board the Wi-Fi shield connects to shouldn't have any other network interface, for example Ethernet.)*
ESP8266 is a fallback option if the build is for unsupported platform.
#### Connecting the ESP8266 ####
To connect the ESP8266 module to your development board, look at the [ESP8266 Cookbook page](https://developer.mbed.org/users/4180_1/notebook/using-the-esp8266-with-the-mbed-lpc1768/). In general, this means hooking up the ESP8266 TX pin to `D0` and the ESP8266 RX pin to `D1` on your development board.
**Note:** On NUCLEO development boards, pins `D0` and `D1` are used for serial communication with the computer. Use pins `D8` (to ESP8266 TX) and `D2` (to ESP8266 RX) instead.
#### Connecting the X-NUCLEO-IDW0XX1 ####
To connect the [X-NUCLEO-IDW04A1](http://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-boards/stm32-ode-connect-hw/x-nucleo-idw04a1.html) or [X-NUCLEO-IDW01M1](https://developer.mbed.org/components/X-NUCLEO-IDW01M1/) expansion board to your NUCLEO development board, plug the expansion board on top of the NUCLEO board using the Arduino or Morpho connector.
##  Getting started ##
1. Import the example.
   ```
   mbed import mbed-os-example-wifi
   cd mbed-os-example-wifi
   ```
   
2. Configure the Wi-Fi shield to use.
   Edit ```mbed_app.json``` to include the correct Wi-Fi shield, SSID and password:
   ```
       "config": {
 	  "wifi-shield": {
               "help": "Options are WIFI_ESP8266, WIFI_IDW0XX1",
               "value": "WIFI_ESP8266"
        	  },
           "wifi-ssid": {
               "help": "WiFi SSID",
               "value": "\"SSID\""
           },
           "wifi-password": {
               "help": "WiFi Password",
               "value": "\"Password\""
           }
       },
   ```
   Sample ```mbed_app.json``` files are provided for ESP8266 (```mbed_app_esp8266.json```), X-NUCLEO-IDW04A1 (```mbed_app_idw04a1.json```) and X-NUCLEO-IDW01M1 (```mbed_app_idw01m1```).
   
   For built-in Wi-Fi, ignore the value of `wifi-shield`.
3. Compile and generate binary.
   For example, for `GCC`:
   ```
   mbed compile -t GCC_ARM -m UBLOX_EVK_ODIN_W2
   ```
   
 4. Open a serial console session with the target platform using the following parameters:
 
    * **Baud rate:** 9600
    * **Data bits:** 8
    * **Stop bits:** 1
    * **Parity:** None
 
 5. Copy or drag the application `mbed-os-example-wifi.bin` in the folder `mbed-os-example-wifi/BUILD/<TARGET NAME>/<PLATFORM NAME>` onto the target board.
 
 6. The serial console should display a similar output to below, indicating a successful Wi-Fi connection:
 
 ```
 WiFi example
Scan:
Network: Dave Hot Spot secured: Unknown BSSID: 00:01:02:03:04:05 RSSI: -58 Ch: 1
1 network available.
Connecting...
Success
MAC: 00:01:02:03:04:05
IP: 192.168.0.5
Netmask: 255.255.255.0
Gateway: 192.168.0.1
RSSI: -27
Sending HTTP request to www.arm.com...
sent 38 [GET / HTTP/1.1]
recv 64 [HTTP/1.1 301 Moved Permanently]
Done
```
## Troubleshooting
If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.