讀取特性的當前值。如果特征在遠程設備上,將發送讀取請求。
用法
bleCharacteristic.readValue(buffer, length)
bleCharacteristic.readValue(value)
參數
- buffer:將值讀入長度的字節數組:緩衝區參數的大小(以字節為單位)
- value: 將值讀入的變量(通過引用)
返回
- Number of bytes讀
示例
while (peripheral.connected()) {
// while the peripheral is connected
// check if the value of the simple key characteristic has been updated
if (simpleKeyCharacteristic.valueUpdated()) {
// yes, get the value, characteristic is 1 byte so use byte value
byte value = 0;
simpleKeyCharacteristic.readValue(value);
if (value & 0x01) {
// first bit corresponds to the right button
Serial.println("Right button pressed");
}
if (value & 0x02) {
// second bit corresponds to the left button
Serial.println("Left button pressed");
}
}
}
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