There is Homeridge sketch. I want to add to it the "smoothness of switching" colors. Now, when the color / percent of the glow changes, it all somehow jerks (not smooth).
It seems like it can be implemented via FadeSpeed, I don't know exactly..
Help 
#include <ESP8266WiFi.h>
#include <Adafruit_NeoPixel.h>
#include <math.h>
//////////////////////////////////////////////////////////
// Which pin On which pin is the ESP8266-12E connected to the NeoPixels
#define PIN 4
// How many NeoPixels are attached to the ESP8266-12E
#define NUMPIXELS 8
// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
///////////////////////////////////////////////////////////////////
WiFiServer server(80); //Set server port
String readString; //String to hold incoming request
String hexString = "000000"; //Define inititial color here (hex value)
int state;
int r;
int g;
int b;
float R;
float G;
float B;
int x;
int V;
const char* ssid = "***";
const char* password = "***";
IPAddress ip(192,168,1,110); // set a fixed IP for the NodeMCU
IPAddress gateway(192,168,1,1); // Your router IP
IPAddress subnet(255,255,255,0); // Subnet mask
////////////////////////////////////////////////////////////////////
void WiFiStart() {
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
WiFi.config(ip, gateway, subnet);
while (WiFi.status() != WL_CONNECTED) {
delay(100);
Serial.print("_");
}
Serial.println();
Serial.println("Done");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("");
server.begin();
}
void allOff() {
for(int i=0;i<8;i++)
strip.setPixelColor(i, 0, 0, 0);
strip.show();
}
//Write requested hex-color to the pins
void setHex() {
state = 1;
long number = (long) strtol( &hexString[0], NULL, 16);
r = number >> 16;
g = number >> 8 & 0xFF;
b = number & 0xFF;
for(int i=0;i<8;i++)
strip.setPixelColor (i, r, g, b);
strip.show();
}
//Compute current brightness value
void getV() {
R = roundf(r/2.55);
G = roundf(g/2.55);
B = roundf(b/2.55);
x = _max(R,G);
V = _max(x, B);
strip.setBrightness(V);
strip.show();
}
//For serial debugging only
void showValues() {
Serial.print("Status on/off: ");
Serial.println(state);
Serial.print("RGB color: ");
Serial.print(r);
Serial.print(".");
Serial.print(g);
Serial.print(".");
Serial.println(b);
Serial.print("Hex color: ");
Serial.println(hexString);
getV();
Serial.print("Brightness: ");
Serial.println(V);
Serial.println("");
}
void setup(){
Serial.begin(115200);
setHex(); //Set initial color after booting. Value defined above
WiFi.mode(WIFI_STA);
WiFiStart();
showValues(); //Uncomment for serial output
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
//Reconnect on lost WiFi connection
if (WiFi.status() != WL_CONNECTED) {
WiFiStart();
}
WiFiClient client = server.available();
if (!client) {
return;
}
while(client.connected() && !client.available()) {
delay(1);
}
//Respond on certain Homebridge HTTP requests
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (readString.length() < 100) {
readString += c;
}
if (c == '\n') {
Serial.print("Request: "); //Uncomment for serial output
Serial.println(readString); //Uncomment for serial output
//Send reponse
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
//On
if(readString.indexOf("on") >0) {
setHex();
showValues();
}
//Off
if(readString.indexOf("off") >0) {
allOff();
showValues();
}
//Set color
if(readString.indexOf("set") >0) {
hexString = "";
hexString = (readString.substring(9,15));
setHex();
showValues();
}
//Status on/off
if(readString.indexOf("status") >0) {
client.println(state);
}
//Status color (hex)
if(readString.indexOf("color") >0) {
client.println(hexString);
}
//Status brightness (%)
if(readString.indexOf("bright") >0) {
getV();
client.println(V);
}
delay(1);
client.stop();
readString="";
}
}
}
}
}