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only notify needed (#1562)

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* only notify needed

* added docs
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Peli de Halleux 2018-10-30 19:57:01 -07:00 committed by GitHub
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2 changed files with 20 additions and 1 deletions
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19
docs/device/bluetooth/hf2.md Normal file
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# Bluetooth HF2
The Bluetooth HF2 service implements a subset of [HF2](https://github.com/Microsoft/uf2/blob/master/hf2.md), namely the serial message logging.
## Service
### HF2 service
* UUID: ``b112f5e6-2679-30da-a26e-0273b6043849``
### TX Characteristic
* Optional
* UUDI: ``b112f5e6-2679-30da-a26e-0273b604384a``
* NOTIFY only
This characteristic mostly emits HF2 serial messages. The first byte contains the type of message and length in the lower 6 bits. The message contains up to 19 bytes.
This service is supported by the MakeCode editor to receive messages.

2
libs/bluetooth/BLEHF2Service.cpp
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@ -7,7 +7,7 @@ BLEHF2Service::BLEHF2Service(BLEDevice &_ble) :
ble(_ble) ble(_ble)
{ {
GattCharacteristic txCharacteristic(BLEHF2TxCharacteristicUUID, (uint8_t *)&txCharacteristicMessage, 0, GattCharacteristic txCharacteristic(BLEHF2TxCharacteristicUUID, (uint8_t *)&txCharacteristicMessage, 0,
sizeof(txCharacteristicMessage), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY); sizeof(txCharacteristicMessage), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
// Initialise our characteristic values. // Initialise our characteristic values.
memset(&txCharacteristicMessage, 0, sizeof(txCharacteristicMessage)); memset(&txCharacteristicMessage, 0, sizeof(txCharacteristicMessage));