Write Wifi Network to NDEF tag: WifiHelper for writing a payload to your ndef tag.

WifiHelper.ts

// Author:Github - @mnirm 
export class WifiHelper {
    CryptoType: CryptoType = new CryptoType();
    AuthType: AuthType = new AuthType();

    
    public CredsToPayload(WifiCredentials: IWiFiCredentials){
        let payload = [0x10, 0x0E]; // Credential same for every wifi network

        // Network ID
        payload.push(0x10, 0x26, 0x00, 0x01, 0x01); // Network ID standard no parameter

        // Network name
        payload.push(0x10, 0x45); // Network name label "Network Name:" part in text
        let networkNameArr = this.stringToHexArr(WifiCredentials.NetworkName); // Convert to hexadecimal and get length
        if(networkNameArr.length < 255){ // Check if network name is smaller than first byte
            payload.push(0x00);
            payload.push(networkNameArr.length);
        }
        payload = payload.concat(networkNameArr); // Add network name

        // Authentication
        payload.push(0x10, 0x03); // Authentication label
        payload.push(0x00, 0x02); // Length bytes authentication type
        payload = payload.concat(WifiCredentials.AuthenticationType); // Add authentication type

        // Encryption
        payload.push(0x10, 0x0F); // Encryption label
        payload.push(0x00, 0x02); // Length bytes encryption type
        payload = payload.concat(WifiCredentials.EncryptionType); // Add authentication type
        
        // Network key
        payload.push(0x10, 0x27); // Network key label
        let networkKeyArr = this.stringToHexArr(WifiCredentials.NetworkKey); // Convert to hexadecimal and get length
        if(networkKeyArr.length < 255){ // Check if network key is smaller than first byte
            payload.push(0x00);
            payload.push(networkKeyArr.length);
        }
        payload = payload.concat(networkKeyArr); // Add network key

        // Mac Address
        payload.push(0x10, 0x20); // Mac addres label
        payload.push(0x00, 0x06); // Length mac address
        payload.push(0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF); // Broadcast address
        
        let payloadSlice = payload.length - 2;
        payload.splice(2, 0, 0x00, payloadSlice); // Adding amount of bytes in payload - 4 on the second place in the array

        return payload;
    }
    
    private stringToHexArr (text) {
        var decimals = [];
     
        for (var i = 0; i < text.length; i += 1) {
            decimals.push(text.charCodeAt(i));
        }
        return decimals;
    }

}

export class CryptoType {
    public static CRYPT_NONE = [0x00, 0x01];
    public static CRYPT_WEP = [0x00, 0x02];
    public static CRYPT_TKIP =[0x00, 0x04];
    public static CRYPT_AES = [0x00, 0x08];
    public static CRYPT_AES_TKIP = [0x00, 0x0C];
}

export class AuthType{
    public static AUTH_OPEN = [0x00, 0x01];
    public static AUTH_WPA_PERSONAL = [0x00, 0x02];
    public static AUTH_SHARED = [0x00, 0x04];
    public static AUTH_WPA_ENTERPRISE = [0x00, 0x08];
    public static AUTH_WPA2_ENTERPRISE = [0x00, 0x10];
    public static AUTH_WPA2_PERSONAL = [0x00, 0x20];
    public static AUTH_WPA_WPA2_PERSONAL = [0x00, 0x22];
}

export interface IWiFiCredentials{
    NetworkName: string,
    AuthenticationType: number[],
    EncryptionType: number[],
    NetworkKey: string,
    MacAddress?: string
}