Adding HM-10 Compatibility with Small Changes to Code

Hello! I've been playing with a forked version of the vesc-tool and just found an easy way to add HM-10 compatibility alongside the NRF chip which is currently supported. The NRF chip is superior since it can operate at 115200 Baud and I find the HM-10 is stable only to 19200 Baud. I'd make this a pull request, but code is forked and now head is a few commits in front, also the changes are minimal so I'll just outline here. The key thing I found that made this easy was an AT command which creates adds a second characteristic to the HM-10 service UUID. You will need to access the hardware serial of your HM-10 module and send the following AT command (thorough guide here):

AT+FFE21

While your at it you may want to set your BAUD to 19200 to maximize data rate with the following AT command:

AT+BAUD1

The service UUID is different for the HM-10 as compared to the vesc-tool so there's a couple snippets that need to be added to bleuart.cpp to try both UUIDs. First I create to UUIDs to try:

    mServiceUuidtry1 = "0000ffe0-0000-1000-8000-00805f9b34fb";
    mRxUuidtry1 = "0000ffe2-0000-1000-8000-00805f9b34fb";
    mTxUuidtry1 = "0000ffe1-0000-1000-8000-00805f9b34fb";
    mServiceUuidtry2 = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
    mRxUuidtry2 = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
    mTxUuidtry2 = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";

These new variables will also need to be declared in the header file.

Then the service discovered method just needs a slight modification to check both possible services:

void BleUart::serviceDiscovered(const QBluetoothUuid &gatt)
{
    if (gatt==QBluetoothUuid(QUuid(mServiceUuidtry1))){
        mServiceUuid = mServiceUuidtry1;
        mRxUuid = mRxUuidtry1;
        mTxUuid = mTxUuidtry1;
        qDebug() << "BLE UART service found!";
        mUartServiceFound = true;
    }
    if (gatt==QBluetoothUuid(QUuid(mServiceUuidtry2))){
        mServiceUuid = mServiceUuidtry2;
        mRxUuid = mRxUuidtry2;
        mTxUuid = mTxUuidtry2;
        qDebug() << "BLE UART service found!";
        mUartServiceFound = true;
    }
}

Cheers,

Jeff