This should be simple but for the life of me I can’t work out what is missing.
I have an arduino nano wired up to an adafruit 24 led neopixel ring and a HC-06 bluetooth receiver.
The code blocks for the ring and BlynkBlink to the inbuilt led work separately, i.e., before adding in the Blynk Write block. Even after this, I can control the inbuilt led with a digital button in the app, but get nothing from the ring.
I have set up a slider to just change the red value for the ring, leaving the other two at 0.
The HC-06 pairs with the Samsung phone, and communicates with the inbuilt led on the nano through a digital button on the app.
• Blynk Library version 1.8.12
As I said, this should be simple but can’t see what is missing either from the write block or elsewhere.
• Add your sketch code. 
Code should be formatted as example below.
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#include <Adafruit_NeoPixel.h>
#include <SoftwareSerial.h>
SoftwareSerial DebugSerial(0, 1); // RX, TX
#define BLYNK_PRINT DebugSerial
#include <BlynkSimpleSerialBLE.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "7d3f3e7dd5094d0baf71571771434b97";
// data pin
#define PIN 6
// led count
#define CNT 24
int r;
//# define g 0
//#define b 255
int position = 6;
Adafruit_NeoPixel strip = Adafruit_NeoPixel(CNT, PIN, NEO_GRB + NEO_KHZ800);
BLYNK_WRITE(V0)
{
int r = param.asInt();
Serial.print("V0 Slider value is: ");
Serial.println(r);
}
void setup() {
strip.begin();
Serial.begin(9600);
Serial.begin(9600);
Blynk.begin(Serial, auth);
}
void loop() {
// saturation - max
// value - 0-255
// strip.setPixelColor((position of brightest pixel (0-23)) % CNT, red,green,blue));
Blynk.run();
strip.setPixelColor((position), r,0,0);
strip.show();
position++;
position %= CNT;
delay(0);
}