Multi-file arduino esp8266 sketch sharing a reference to server - arduino

Question

As my sketches get bigger, the code looks awful as one file and the number of global variables is too high.
For the webconfig part of my sketch the device attempts to get online and if it fails it scans for available wifi networks, goes into Access Point Mode, starts a server, sends the list of ssid's and listens for a response of an ssid/passwd pair. The server is only for the configuration.
Ideally I'd like the cleaned up main.ino file to look like
#include "config.h"
void setup(){
Serial.begin(115200);
Serial.println();
Serial.println("--------------------------");
Serial.println("ESP8266 multifile");
Serial.println("--------------------------");
getOnline();
}
void loop(){
if(IN_CONFIG_MODE){
server.handleClient();
}
}
with a config.h something like..
#ifndef config_h
#define config_h
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
ESP8266WebServer server;
void getOnline();
#endif
and then a config.cpp where it does all stuff described above yet gives the main.ino program access to the server instance so it can listen in the main loop.
#include "config.h"
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
char *espssid = "espAPsb";
char *ssid = "street_no_vale2";
char *pwd = "jjjjjjjjx";
char ssids[300];
extern server(80);
void handleRoot(){
server.send(200, "text/html", "<h1>root of espAPsb AP server</h1>");
//send json of available ssids
}
void scan(){
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
int n = WiFi.scanNetworks();
Serial.println("scan done");
if (n == 0)
Serial.println("no networks found");
else
{
Serial.print(n);
Serial.println(" networks found");
for (int i = 0; i < n; ++i)
{
// Print SSID and RSSI for each network found
Serial.print(i + 1);
Serial.print(": ");
Serial.print(WiFi.SSID(i));
Serial.print(" (");
Serial.print(WiFi.RSSI(i));
Serial.print(")");
Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
delay(10);
}
}
Serial.println("");
}
void setupAP(){
WiFi.softAP(espssid);
server.on("/", handleRoot);
server.begin();
Serial.println();
Serial.print("connected as AP ");
Serial.println(espssid);
Serial.print("IP address: ");
Serial.println(WiFi.softAPIP());
}
void getOnline(){
WiFi.begin(ssid, pwd);
int tries =0;
int success=1;
while (WiFi.status() != WL_CONNECTED ) {
delay(500);
Serial.print(".");
tries++;
if (tries==15){
success=0;
Serial.println("WiFi not connected");
scan();
setupAP();
break;
}
}
if (success){
Serial.println("");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
}
}

Answer 1

You can make an own library from your networking code, which you can easily reuse.
https://www.arduino.cc/en/Hacking/LibraryTutorial
Alternatively, you can use multiple "tabs" in Arduino IDE which works like a standard multi-source project. http://arduino.land/FAQ/content/7/43/en/breaking-a-sketch-into-multiple-files.html
(Btw, StackExchange hosts a dedicated Ardunio microsite here: https://arduino.stackexchange.com/ Have fun there :)