Arduino Forum

Products => WiFi Shield 101 => Topic started by: rs2845 on Jan 26, 2019, 06:31 pm

Title: Arduino WiFi101 Library - Pass WiFi and WiFiClient to child classes
Post by: rs2845 on Jan 26, 2019, 06:31 pm

I'm slowly getting to work on an IoT project involving a WiFi client and am trying to write my own libraries to make for a cleaner implementation. Full disclosure: I'm a beginner!

I am using Adafruit's ItsyBitsy M4 and the ATWINC1500 breakout with the WiFi101 library and all is going great when everything is in a single file. However, I want to be able to modularise my code by its purpose into classes which for the most part has been successful. I can then pass pointers (`*`) of the connected hardware (i.e. NeoPixel and Uart for serial ports) to the classes "set" method. Though, I have been unable to do this with the `WiFiClass` and `WiFiClient` classes.

I've had a go at passing the `WiFi` and `WiFiClient` to my classes as a pointer (see code below), in the same way I have successfully done it with Uart Classe for my serial ports (though I have to use `->` and not `.` for methods). The issue is, whilst I am able to determine (what I believe to be) the current client status, no data is ever returned in my loop(). I have getter and setter methods to get/set the `WiFiClient` pointer, yet there's no data when I use them.

It also seems that `WiFiClass` (the `WiFi` object) is being automatically created when the sketch starts which makes me uncomfortable as I haven't declared it anywhere.

My questions:

1. Is there any way to explicitly declare a `WiFiClass` and initialise a custom WiFi101 connection, as opposed to using the default `WiFi` class provided by the library? For clarity I like to see where things are initialised and not just accept that they have been.
2. Is it actually possible for me to pass the `WiFiClient` class through to my own classes and have all classes use the same single instance back in `main.cpp` via pointers?

Below is what I have tried so far:

NetworkInterface class
(originally designed to hold the entire instantiated WiFi class, but currently just using WiFiClient):

Code: [Select]

    // network-interface.cpp:
    WiFiClient NetworkInterface::getNetworkClient() {
        return *_networkClient;
    byte NetworkInterface::setNetworkInterface(WiFiClient *newNetworkInterface, interfacetype_t mode) {
        if (mode >= 0 && mode <= 3) {
            networkMode = mode;
        } else {
            networkMode = -1; // TODO: Use enum
            return -1;
        _networkClient = newNetworkInterface;
        return mode;
    // .header file:
    #include "Arduino.h"
    typedef enum {
    } interfacetype_t;
    class NetworkInterface {
            bool connectToSSID(byte ssid[], byte password[]);
            bool getConnectionStatus();
            bool disconnectFromNetwork();
            interfacetype_t getNetworkMode();   
            WiFiClient getNetworkClient();
            byte setNetworkInterface(WiFiClient *newNetworkInterface, interfacetype_t mode);  // 26.01.2019 - LIMITED TO WiFICLIENT, UNSURE ABOUT WiFiClass
            interfacetype_t networkMode;
            WiFiClient *_networkClient;

main class:

Code: [Select]
    // main.cpp:
    #include <SPI.h>
    #include <WiFi101.h>
    #include "arduino_secrets.h"
    #include "network-interface.h"
    char ssid[] = SECRET_SSID;        // your network SSID (name)
    char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
    int keyIndex = 0;            // your network key Index number (needed only for WEP)
    int status = WL_IDLE_STATUS;
    char server[] = "";    // name address for Google (using DNS)
    WiFiClient client;
    NetworkInterface networkInterface;
    void setup() {
        //Initialize serial and wait for port to open:
        while (!Serial);
        Serial.println("= = = Simple Client-Server Test = = = ");
        WiFi.setPins(A5, A4, A3, A2);
        if (WiFi.status() == WL_NO_SHIELD) {
            Serial.println("WiFi shield not present");
            while (true);
        // attempt to connect to WiFi network:
        while (status != WL_CONNECTED) {
            Serial.print("Attempting to connect to SSID: ");
            // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
            status = WiFi.begin(ssid, pass);
            // wait for connection
        Serial.println("Connected to wifi");
        Serial.println("\nStarting connection to server...");
          Pass the network client (and hopefully soon WiFi class with hardware connection data) to NetworkInterface class
        networkInterface.setNetworkInterface(&client, 0);
    void loop() {
        // if there are incoming bytes available
        // from the server, read them and print them:
        WiFiClient myClient = networkInterface.getNetworkClient();
        if (myClient.available()) {
            Serial.print("| REMOTE :: Server Has Responded: |");
            while (myClient.available()) {
                char c =;
        // if the server's disconnected, stop the myClient:
        if (!myClient.connected()) {
            Serial.println("CLIENT :: Disconnecting");
            // do nothing forevermore:
            while (true);
    void makeTestCallToPusher() {
          char serverURLTest[] = "";
          WiFiClient myClient = networkInterface.getNetworkClient();
        if (myClient.connect(serverURLTest, 80)) {
            Serial.print("CLIENT :: Connected - ");Serial.print(serverURLTest);Serial.print("\n");
            myClient.println("GET /test HTTP/1.1");
            myClient.println("Upgrade: WebSocket");
            myClient.println("Connection: Upgrade");
            myClient.println("Origin: ARDUINO_TEST");
            myClient.println("Host: eu");
            myClient.println("Connection: close");
    void printWiFiStatus() {
        // print the SSID of the network you're attached to:
        Serial.print("SSID: ");
        // print your WiFi shield's IP address:
        IPAddress ip = WiFi.localIP();
        Serial.print("IP Address: ");
        // print the received signal strength:
        long rssi = WiFi.RSSI();
        Serial.print("signal strength (RSSI):");
        Serial.println(" dBm");