Transmit Data As Fast As Possible

[kevin-webster]

I've set up a UART characteristic and I'm wanting to stream data from a sensor via the BLECharacteristic.

The UART service and TX/RX characteristics are defined as follows:

BLEService uartSrv("6E400001B5A3F393E0A9E50E24DCCA9E");
BLECharacteristic rxChar("6E400002B5A3F393E0A9E50E24DCCA9E", BLEWriteWithoutResponse, 32);
BLECharacteristic txChar("6E400003B5A3F393E0A9E50E24DCCA9E", BLENotify, 32);

And I send data out via:

txChar.setValue((const unsigned char *)&data, sizeof(data));

What I've noticed is that after about 5/10 successful transmissions, the BLE engine seems to stop and no more data is transmitted.

Am I doing this correctly? What mechanism can I implement to ensure that the data is successfully sent before I can start another transmission?

[dots123]

Hi webzoid,

Have you managed to solve the problem? I was looking in BLESerial.cpp and they flush the data after they send some chars. Take a look here: https://github.com/sandeepmistry/arduino-BLEPeripheral/blob/master/examples/serial/BLESerial.cpp

[kevin-webster]

Hi @dots123

I haven't yet solved the issue. I call poll (as in the BLESerial.cpp flush function) after the txChar.setValue(...) function yet this doesn't seem to make a difference.