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Great! Did you have to make the change I described above? If so I'll change the example code on the website

Yup! That is what fixed it!

I got the project to work the way I was expecting: the device may be flipped to turn the fan on and off and is controlled by a temperature. I used node with @abandonware/noble for the server like I wished! Now I know enough to make the project for my sister. I am super stoked!

Thanks for the help! I now understand BLE two way communications!

BTW -- if you want to post it as a project, I have the completed thermostat code and instructions here:
https://github.com/boomninjavanish/motion-thermostat

I will improve upon this project over time as I really needed the thermostat. (I plan on adding two more features to it soon.)

Does the code make the Puck's light flash?

It flashed!

And then use the code from https://www.espruino.com/BLE+Advertising­#node-js - either JS or Python. The first byte you get will be the button press count - so when it changes you can do your HTTP request - and the second byte is the temperature, so there's no need to request it - you just always have it available.

I will give this a try tomorrow. Thanks for the help!

Tried the example on the raspberry pi and got this output:

ubuntu@boontoo:~/motion-thermostat$ node test
Noble: stateChange -> poweredOn
Found device:  45:73:5f:0c:0d:10
Found device:  64:2b:d2:47:bd:00
Found device:  cc:f4:11:98:5b:01
Found device:  05:c9:79:4c:61:39
Found device:  12:7d:20:2d:64:3b
Found device:  0e:a1:1e:0e:0e:c2
Found device:  75:d9:c4:33:59:a8
Found device:  58:c6:8d:82:1f:a2
Found device:  06:42:db:89:b9:90
Found device:  2f:6a:ef:b1:6d:d2
Found device:  74:2f:a8:98:9c:57
Found device:  78:02:b7:23:6b:c2
Found device:  49:92:1d:5b:82:d6
Found device:  4b:ef:f5:a0:e9:2a
Found device:  6b:73:24:90:68:e4
Found device:  ea:c5:8b:e0:a4:fb
Found device:  68:ce:65:cb:86:28
Found device:  0e:a1:1e:0e:0e:c2
Found device:  0c:80:5f:d6:bd:0c
Found device:  0c:80:5f:d6:bd:0c
Found device:  05:c9:79:4c:61:39
Found device:  90:dd:5d:e8:59:50
Found device:  54:e4:fc:4c:f1:9b
Found device:  0e:a1:1e:0e:0e:c2
Found device:  45:73:5f:0c:0d:10
Found device:  64:2b:d2:47:bd:00
Found device:  3d:7f:60:53:b0:7d
Found device:  55:2b:6a:2d:44:29
Found device:  5f:a3:6c:c7:29:84
Found device:  12:7d:20:2d:64:3b
Found device:  75:d9:c4:33:59:a8
Found device:  58:c6:8d:82:1f:a2
Found device:  06:42:db:89:b9:90
Found device:  2f:6a:ef:b1:6d:d2
Found device:  74:2f:a8:98:9c:57
Found device:  0e:a1:1e:0e:0e:c2
Found device:  62:5e:f6:87:87:d9
Found device:  45:9a:95:02:55:00
Found device:  05:c9:79:4c:61:39
Found device:  90:dd:5d:e8:59:50
Found device:  54:e4:fc:4c:f1:9b
Found device:  48:10:c1:2a:74:cc
Found device:  48:10:c1:2a:74:cc
Found device:  f4:fe:fb:c4:58:4e
Found device:  4e:b6:b3:37:6d:f9
Found device:  4e:b6:b3:37:6d:f9
Found device:  40:2d:01:84:21:eb
Found device:  08:a1:94:e2:dd:f7
Found device:  0e:a1:1e:0e:0e:c2
Found device:  0c:80:5f:d6:bd:0c
Found device:  69:be:d5:4e:3a:dc
Found device:  6c:ef:9f:dd:1d:ae
Found device:  64:2b:d2:47:bd:00
Found device:  f4:fe:fb:c4:58:4e
Found device:  55:2b:6a:2d:44:29
Found device:  67:8c:04:e3:bf:13
Found device:  67:8c:04:e3:bf:13
Found device:  90:dd:5d:e8:59:50
Found device:  7c:18:2f:c5:ce:04
Found device:  12:7d:20:2d:64:3b
Found device:  5f:a3:6c:c7:29:84
Found device:  58:c6:8d:82:1f:a2
Found device:  5f:a3:6c:c7:29:84
Found device:  45:9a:95:02:55:00
Found device:  61:d5:e4:67:76:80
Found device:  61:d5:e4:67:76:80
Found device:  68:ce:65:cb:86:28
Found device:  08:a1:94:e2:dd:f7
Found device:  90:dd:5d:e8:59:50
Found device:  f2:09:f2:78:7d:9a
BT> Connecting
Found device:  f2:09:f2:78:7d:9a
BT> Connecting
BT> Connected
BT> Connected
Disconnected
Disconnected
Disconnected
Disconnected
^Cubuntu@boontoo:~/motion-thermostat$

Here is the output I receive when I run the example code on my mac. It hangs at the second "connected":

± % node test.js                                                                                                  !6614
Noble: stateChange -> poweredOn
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  be-89-30-00-21-95
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  90-dd-5d-e8-59-50
Found device:  90-dd-5d-e8-59-50
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  
Found device:  f2-09-f2-78-7d-9a
BT> Connecting
Found device:  f2-09-f2-78-7d-9a
BT> Connecting
BT> Connected
BT> Connected
^C

EDIT: Changed the wording below to be less confusing.

I am not making direct HTTP requests from the Puck but from a raspberry pi. How does one press a button on the device to trigger the HTTP request on the raspberry pi? Then after that poll the puck for the temperature?

Sorry, I am new to BLE and have been confused by hours of reading about it.

tl;dr version: how do I push changes to a central device (Raspberry Pi)? Libraries I have tried do not discover UART service and characteristics.

Hi!

I am working on a project to help my disabled sister to operate devices in her house on her own. I am planning on using a combination of the Puck's accelerometer and a Raspberry Pi running this project: https://webgazer.cs.brown.edu/#examples. I hope to publish this as open source so that others may use the project for their needs as well. (Products in the medical industry are VERY expensive. I am hoping that making some things available for free would help those who cannot afford an expensive solution from Tobii/Dynavox.)

She cannot speak, walk, or move very well. However, she can make her Barbie dance by shaking it. I am hoping to harness that movement as an trigger for various home automation tasks in the future. My end-goal is to have her control everything in her environment. She would do this by gazing at the Raspberry Pi's screen to change which device/setting and shake the Puck to change the state of that device. She lives in an impoverished area without access to the internet, so I am looking to make a closed network of IoT devices for her.

Right now, I am starting small: I am making the Puck act as a thermostat and controller for a fan in my kitchen using http get requests to IFTTT.

After multiple hours of experimentation, I was able to get the Puck to receive commands from my macos device. However, I am having trouble figuring out how to have the server wait for a command from the the Puck. Is there a way to have the puck push data to the server? For example, if the puck has been flipped (accel.z < 0), I want to send an instruction to the server to shut off the fan. I also want to do this using as little power as possible.

One last thing: I was able to get the bleak library to work on both macos and Ubuntu on the Raspberry Pi. However, when I attempt to discover services and characteristics, the Puck doesn't respond. I have tried multiple libraries in both node js and python to no avail. (I would love to use @abandonware/noble in node but I could not get that to discover the UART characteristics as well. ) EDIT: To be clear: it does TX and RX to and from the server but discovery doesn't work.

Thanks for reading all of this. Here a link to the GitHub for the thermostat. I will make the eye gaze/motion project open source and available when I start it as well.

https://dunlap.media
https://www.twitch.tv/twitchplaysthesynth