Puck.js Connect to Adafruit Feather Board

Thanks for this info Gordon - and apologies for the delay in getting this updated. I think I'm really stuck on the eval aspect of how to receive data to the Puck.js. I'm sure I'm just missing something trivial in the library that once I see it, it will be so obvious. I tried to reduce the code to just a basic - send a simple vale "1" to the Arduino board, and once the board receives a value of "1" return back to the Puck a value of "1" to confirm the data.

Puck Code:

// Variables
var feather = "ff:8d:05:ae:17:64 random";
var uart;

function sendMessage() {
  console.log("Trying to Connect");
  NRF.requestDevice({ filters: [{ id: feather }], active:true }).then(function(device) {
  //return require("ble_simple_uart").write(device, "1");
  return require("ble_uart").connect(device);
}).then(function(uart) {
  uart.write("1");
}).then(function() {
  console.log("Message sent successfully.");
  uart.on('data', function(d) {
    console.log("Got:"+JSON.stringify(d));
  });
});
}

// Send a message when the button is pressed
setWatch(function() {
  sendMessage();
}, BTN, { edge: "rising", debounce: 50, repeat: true });

Arduino Code:

[#include](https://forum.espruino.com/search/?q=%23include) <Arduino.h>
[#include](https://forum.espruino.com/search/?q=%23include) <SPI.h>
[#include](https://forum.espruino.com/search/?q=%23include) "Adafruit_BLE.h"
[#include](https://forum.espruino.com/search/?q=%23include) "Adafruit_BluefruitLE_SPI.h"
[#include](https://forum.espruino.com/search/?q=%23include) "Adafruit_BluefruitLE_UART.h"
[#include](https://forum.espruino.com/search/?q=%23include) "BluefruitConfig.h"

[#if](https://forum.espruino.com/search/?q=%23if) SOFTWARE_SERIAL_AVAILABLE
  [#include](https://forum.espruino.com/search/?q=%23include) <SoftwareSerial.h>
[#endif](https://forum.espruino.com/search/?q=%23endif)

[#define](https://forum.espruino.com/search/?q=%23define) FACTORYRESET_ENABLE         1
[#define](https://forum.espruino.com/search/?q=%23define) MINIMUM_FIRMWARE_VERSION    "0.6.6"
[#define](https://forum.espruino.com/search/?q=%23define) MODE_LED_BEHAVIOUR          "MODE"
[#define](https://forum.espruino.com/search/?q=%23define) LED_BUILTIN                 13

Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_CS, BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);

void error(const __FlashStringHelper* err) {
  Serial.println(err);
  while (1);
}

int incomingByte = 0;
String readString;

void startRaceSequence() {
  Serial.println(F("if statement worked"));
  Serial.print("Sending Start: 1");
  ble.println("1");
}

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial1.begin(9600);
  Serial.begin(115200);

  ble.echo(false);
  Serial.println("Requesting Bluefruit info:");
  ble.info();
  Serial.println();

  ble.verbose(false);

  Serial.println(F("Setting device name to 'Splitz Start Beacon'"));
  if (!ble.sendCommandCheckOK(F("AT+GAPDEVNAME=Splitz Start Beacon"))) {
    error(F("Could not set device name?"));
  }

  Serial.println(F("Switching to DATA mode!"));
  ble.setMode(BLUEFRUIT_MODE_DATA);

  while (!ble.isConnected()) {
    delay(500);
  }

  if (ble.isConnected()) {
    Serial.println(F("BLE device is connected."));
  }
}

void loop() {
  while (ble.available()) {
    Serial.println("Waiting for message.");
    char c = ble.read();
    readString += c;
    delay(2);
  }

  if (readString.length() > 0) {
    Serial.println(readString);
    if (readString == "1") {      
      // Send back a response message after receiving "1"
      ble.write("Received '1', race sequence triggered");
      startRaceSequence();
    }
  }

  readString = "";
}

I am able to send the value to the Arduino board, and can trigger a function on the Arduino board based on the value sent by the Puck (but usually only when I use the ble uart simple). But am not able to get a value back. I usually receive a CCCD error.

Any direction would be greatly appreciated!