Program receiving Serial Data AFTER sending serial data to Bean

[kdious]

So I am trying to use Node.js and the ble-bean library to send and receive serial data to the Bean. I am able to send Serial data just fine but receiving serial data AFTER writing serial data is a problem. I have written a basic Arduino sketch and Node.js program that essentially does an echo. The javascript program sends a value to the Bean and the Bean should send the same data back. Example code is below. The Arduino sketch works just fine on the bean when I use the Virtual Serial Monitor to send data to and receive data from the Bean. However, when using my Node.js program, I cannot receive data AFTER successfully sending data to the Bean. I have tried both on Mac OS X and Linix and get the same result, so I believe the issue may be with the ble-bean and/or the noble-device libraries.

Has anyone had any success reading data AFTER sending data to the Bean using the ble-bean Node.js module?

I believe that the issue may be related to the fact that the ble-bean library does not set the "\n" character as a delimiter/parser of the data from the bean, but I am not sure. With that said, when I use the PacketLogger bluetooth sniffer on Mac OS X, I do not see the notification come from the bean. However, when I use the Serial Monitor in the Arduino IDE, I do see the notification for the serial characteristic.

I have tried playing around with Node-RED and I am able to get send and receive serial data that way but I was hoping to write my own native Node.js code because I want to use some node modules that are not supported by Node-RED (and I was hoping to avoid porting them to Node-RED).

Any help would be greatly appreciated.

ble-bean library: https://github.com/jacobrosenthal/ble-bean
bean-serial library: https://github.com/monteslu/bean-serial/blob/master/index.js

Sample Code

Arduino sketch:

void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}

void loop() {
// put your main code here, to run repeatedly:
if(Serial.available() > 0) {
int readValue = Serial.parseInt();
Serial.println(readValue);
}
}

Node.js program

/*jslint node: true */
"use strict";

/*

• This script requests the general BLE characteristics from the bean every second.
• Requires a sketch on the Arduino to do a Serial.print() just like you were plugged
• in over a serial cable. Any sketch will do.
  */

var Bean = require('ble-bean');
var SerialPort = require('bean-serial').SerialPort;
var serialPort;
var options = {
logging: true, // default to false
};

var intervalId;
var connectedBean;

Bean.discover(function(bean){
connectedBean = bean;
process.on('SIGINT', exitHandler.bind(this));

[f1erro]

I am having trouble sending serial data to the bean as well

[jacobrosenthal]

I havent looked at a bean in ages. Its totally possible they changed
something.

On Mon, Aug 15, 2016 at 3:53 PM, Mitchell Fierro [email protected]
wrote:

I am having trouble sending serial data to the bean as well

—
You are receiving this because you are subscribed to this thread.
Reply to this email directly, view it on GitHub
#22 (comment),
or mute the thread
https://github.com/notifications/unsubscribe-auth/AAb0dHrkfkDaQVvRRZ2WQYnLyIcJgo3kks5qgMOqgaJpZM4HFoWj
.

[f1erro]

Actually, I've gotten it to work quite well. I didn't use serial-bean like the kdious above. I'll followup with another comment explaining what went wrong with my attempt in a bit