HC-05/06 compatibility

[marknn3]

The HC-05 and HC-06 Bluetooth V2.0 modules (FW VERSION:2.0-20100601) will fail when writing to Characteristic 0xFFE1 with this error:
"NotSupportedError: GATT operation failed for unknown reason"

Instead these modules require Characteristic 0xFFE2 for writing/transmitting.

When I get my hands on a HM-10 or AT-09 I will try to make the BluetoothTerminal class compatible with both module families.

[loginov-rocks]

Hi @marknn3 , Bluetooth 2.0 is not supported by the Web API – that's the only reason for this library to exist, it is to mimic 2.0 over the BLE, so you need BLE modules if you want to communicate with them from the browser :)

[marknn3]

@loginov-rocks Perhaps I don't understand what you mean, but I am 100% able to connect and communicate with a Bluetooth 2.0 module (HC-05) using your BluetoothTerminal (with a patch for which I can provide a PR. Somewhat similar to the ESP32 patch by @Jip-Hop).
The Web API is agnostic to whether it is 2.0 or BLE, as long as the proper services and characteristics are exposed by the module.

[loginov-rocks]

The Web API is agnostic to whether it is 2.0 or BLE, as long as the proper services and characteristics are exposed by the module.

Not really :) Services and characteristics are part of the GATT that is interface for BLE devices. There can be no services nor characteristics without BLE support. And from the other side Web Bluetooth API works only through services and characteristics. This is just how it works, part of the protocols.

So if you able to communicate through Web Bluetooth API from the browser then you have module with BLE support. Could be your modules are not actual HC-05/06 but smarter ones.

[marknn3]

So if you able to communicate through Web Bluetooth API from the browser then you have module with BLE support. Could be your modules are not actual HC-05/06 but smarter ones.

You are right! The 'new version HC-05' which I have is indeed v4.2 BLE! I did not know. The 'older/original' HC-05 Bluetooth v2.0 version indeed does NOT show up in the Web Bluetooth API.

But this still makes a valid use-case for enhancing your BluetoothTerminal to allow different characteristics for RX and TX.

[loginov-rocks]

@marknn3 great news! This use case is supported by the library with the help of constructor or a separate method: https://github.com/loginov-rocks/bluetooth-terminal#new-bluetoothterminalserviceuuid-characteristicuuid-receiveseparator-sendseparator-onconnected-ondisconnected

This repository is just an example of application using the library :)