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I am currently developing an application where I connect from an Android/iOS app to the Raspberry Pi 3 via Bluetooth/BLE. Once paired, the RPi will send temperature measurements to the mobile app.

I searched the internet, and honestly I found many articles and forum topics where they address these issues, but I wasn't fully satisfied with what I found (no step by step guide for newbies).

Skills missing to accomplish this:

  • Creating a node js server that sends data through RPi BLE/Bluetooth
  • Creating a mobile app that connects to RPi and gets the data.

I know there are million ways to do it, but I need the best and quickest solution. I already know how to develop Android Apps, but also I prefer using something like Cordova/PhoneGap (Fast and multi-platform)

Can you please suggest any guides for me to ramp up quickly?

  • I think the first problem is node.js - From what I understand that is a web only interface, so it requires something like nginx. Bluetooth does not support web interfaces - the closest thing would be RFCOMM Serial data. Creating an app... native android you can use Ecclipse or Visual Studio with Xamarin Forms for Android. – Piotr Kula Aug 6 '16 at 19:51
  • @ppumkin Thank you for your comment. Can you please suggest another alternative for node.js on Rpi to accomplish this? – Nick Aug 6 '16 at 20:07
  • @ppumkin Node js has modules that will do this bleno and noble for example. Node does not require a separate web server. I would suggest reading this amazon.com/Make-Bluetooth-Projects-Raspberry-Smartphones/dp/… It will cover most of the issues involved. – Steve Robillard Aug 6 '16 at 20:17
  • That's pretty cool then. I suppose I just learnt to use a web server to expose the API to node. I need to look into that. – Piotr Kula Aug 6 '16 at 22:11
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Of course you can ! You can go very low level and look into ATT/GATT interfaces and commands. They work like AT commands if you've ever used them.

But of course this makes it much simpler : https://github.com/sandeepmistry/noble

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Well for the nodejs part it won't be very complicated. Follow a tutorial and find some way to send req to the server from whatever device you use.

I would recommand this library that would make the use of blueZ easier: https://github.com/intel-iot-devkit/tinyb

First develop your Rpi App using C/C++ and tinyb, once that's done, find a way to pass calls from your device to the server, to your app. You can do that either by using a C daemon that will handle on it's own the bluetooth or via a wrapper from Nodejs to tinyb. Depending on your skills you should go for one or the other solution.

It seems that I might be wrong and that "noble" can be used, but I feel like C approach would be more effective. But I cannot be 100% of that without trying it first. @Kevin Roy thanks for showing noble, looks awesome !

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