Can App Inventor send binary data to a device via BLE?

[Noguchi]

All blocks are above (yesterday).

https://community.appinventor.mit.edu/uploads/default/original/3X/6/5/657f8ce69f05776ba33df859bde280f5911c23fe.png

[Noguchi]

Attachment 1: Communication specifications between BLE device and Android device.

Attachment 2: The blocks created based on the specifications of Attachment 1.

Question: Are the serviceUuid and characteristicUuid settings in the attached blocks correct?
The specifications of Attachment 1 are serviceUuid and characteristicUuid
It is a hexadecimal number.
Is it necessary to change this to ASCII code (?) when setting in block?

Can anyone please tell me?

Attachment 1:

Attachment 2:

[Juan_Antonio]

Try nRF Connect app, with this app you can send values to your device.

HM-10. BLE. Arduino UNO. Notify. Bluetooth. AT. iBeacon. Arrhythmia

1.- Get UUID Service and UUID Characteristic. We install the nRF Connect app that we find in the Google Play Store on our mobile. [hm10_3] Service: 0000ffe0-0000-1000-8000-00805f9b34fb Characteristic: 0000ffe1-0000-1000-8000-00805f9b34fb Notify. Read. Write. WriteNoResponse (therefore we will not be able to use the WriteWithResponse block, we will get the response through RegisterForStrings - Notify.) ...but...wait...wait...Name?...MLT-BT05...not an HM-10...it's a fake...it's a clon..…

Try send directly 53 and 01

[Noguchi]

Thank you for your reply.
The attached blocks that I created based on your app.
When I execute WriteBytes, there is no response or error from the device.
Is there a problem with Characteristic Uuid settings?

[Juan_Antonio]

Have you tried the nRF app?

Have you tried this block?

Try

HM-10. BLE. Arduino UNO. Notify. Bluetooth. AT. iBeacon. Arrhythmia

11.- WriteBytes and WriteStrings. p110i_UNO_hm10_WriteBytes.aia (199.2 KB) [hm10_40] We convert text list ["65","66","67","68","69","70"] to number list_n. [65,66,67,68,69,70] Send this list_n with "WriteBytes". We can also send with "WriteStrings". Notice that WriteStrings adds the NULL character. If you want to avoid it, use the NullTerminateStrings block. // Juan A. Villalpando // http://kio4.com/arduino/161_HM10_BLE.htm #include <SoftwareSerial.h> // El TXD del módulo al pin 2 …

[Noguchi]

I also tried sending (53 1) using WriteBytes, but the same result: no response or error returned from the device.

[Noguchi]

I also tried sending (83 1) using WriteBytes, but the same result: no response or error returned from the device.

[ABG]

He wants to send 'S' = 0x53 = decimal 83

[Noguchi]

Hexadecimal (0x53 1) and decimal (83 1) give the same result.
I suspect there is a problem with the Characteristic Uuid settings. Can you please check it?

[Noguchi]

Properties of "TX CharacteristicUuid 6e400003-b5a3-f393-e0a9-e50e24dcca9e" is NOTIFY".
Is it possible to read device data using readBytes or registerFoBytes?

[Juan_Antonio]

I don't know what the READ code is on your device, so I suggested that you send
53,1

For example in this code made for HM-10 and Arduino IDE, send 53,1 and receive:
53
1

Try send values from nRF app, click arrow...

[Noguchi]

I've solved the problem with a lot of advice from everyone.
Thank you very much.

Executing the EnableBluetooth block after the Connected event now returns the response from the device.

I am sorry that I overlooked the execution of EnableBluetooth and made a fuss.

[ABG]

Thanks for telling us what worked.

Never let a good mistake go to waste.