Noob question about receiving data

[dbasmb]

I have a seemingly simple project to start learning App Inventor but I have run into a snag I can't get around. Basically I want to connect from my Adafruit Feather Bluefruit M0 LE board to my android phone or my iPad Pro. The Feather is measuring the output of a sensor connected to Pin #A0. I am trying to at least see the output of that pin but eventually the calculated values from that Pin and then plot the data. I can get the project App Inventor + IoT: Basic Bluetooth Connection Setup to run where it scans and then connects to my feather (so it says) but I can't get further than that to read data. It seems all the examples I find on the web use BluetoothClient instructions whereas this example uses the BlutoothLE1 extension and therefore BluetoothLE1 instructions. So this is all I've got:

Can you point me in the correct direction? The BluetoothLE1 uses Service and Characteristics UUID but I don't understand them nor can I find descriptions of their use. Can you suggest an example that I can work from?

Thank you

Doug

[Gordon_Lu]

Welcome @dbasmb to our community!

Can you post your .aia file here in the reply? Also, this tutorial here may help you. Link: http://iot.appinventor.mit.edu/assets/tutorials/MIT_App_Inventor_Basic_Connection.pdf

Did you read this tutorial? If yes, I think we need to find another solution.

[dbasmb]

Thanks for the reply. Yes, the tutorial you linked is the one I used. My code shown below is identical to it with no additions. As is, it seems to work. When I press the connect button, it says it is connected and the blue light on my Feather lights up. But it's not clear to me where I start in order to get my data and display it. That's what I'm puzzled by.

Basic_IoT_plus_play.aia (173.7 KB)

Thanks for the help.

Doug

[Joel]

Try looking at these ESP32. MQTT. Broker. Publish. Subscribe. ThingSpeak

https://groups.google.com/forum/#!searchin/mitappinventortest/bluetooth%2420p9X_2i_bluetooth.aia|sort:date/mitappinventortest/tsUYqkXNZ3U/__y8bPk3BwAJ

[Juan_Antonio]

For Bluetooth LE, see these examples (they are for ESP32).

BLE ESP32. Bluetooth. Send. Receive. Arduino IDE. Multitouch

Hello friends, I'll write in this topic about BLE on ESP32, send and receive text, with clock and without clock. Notify. I'll use the codes of Neil Kolban. 0.- Board D1 R32 ESP32. This is a cheap card ($ 5) with the dimensions and shape of the Arduino UNO, but with the ESP32. [esp322pin_h] Search images: D1 R32 ESP32 This card has classic Bluetooth, BLE, WiFi, ADC, DAC, and more feature. This card can be programmed with the Arduino IDE. [comparativa]