Comments (7)
Hey, yeah, we have a working fork for reading data. Nothing pretty, but it gets the job done:
https://github.com/edvijaka/react-native-usbserial
from react-native-usbserial.
How about just giving the port.read() method a fixed buffer? Or we specify the buffersize via param.
The following code is completely untested:
private static final int READ_BUFFER_SIZE = 256;
...
public void readAsync(Promise promise) {
if (port != null) {
byte[] buffer = new byte[READ_BUFFER_SIZE];
try {
int bytesRead = port.read(buffer, SERIAL_TIMEOUT);
String byteString = new String(buffer, 0, bytesRead);
promise.resolve(byteString);
} catch (IOException e) {
promise.reject(e);
}
} else {
promise.resolve(getNoPortErrorMessage());
}
}
from react-native-usbserial.
I studied the source code of this project a little bit and it looks like, for writing data, it just calls this:
return this.UsbSerialModule.writeInDeviceAsync(this.id, value);
Is it much harder to change this to 'read'? What exactly needs to be done to support reading from serial?
from react-native-usbserial.
Hi guys, have anyone implemented it already? I'm willing to pay for it if needed.
from react-native-usbserial.
Hey @GreenGI thank you.
Is this usage correct?
DeviceEventEmitter.addListener('newData', (e) => {
console.log('newData', e);
});
from react-native-usbserial.
Basically - yes. This is how I use it on a component after mounting it:
componentWillMount() {
this.getDeviceAsync().then(device => {
if (device) {
DeviceEventEmitter.addListener('newData', (e) => {
console.log('newData', e);
});
this.readDevice(device.id);
}
});
}
getDeviceListAsync = () => {
return UsbSerialModule.getDeviceListAsync();
};
readDevice = (id) => {
UsbSerialModule.readDeviceAsync(id);
};
from react-native-usbserial.
Hi @GreenGI !
Is the code above still working in your fork?
Could you provide the code for getDeviceAsync()?
Thanks in advance.
from react-native-usbserial.
Related Issues (12)
- Better permission request handler HOT 1
- Is there a way to handle the flow control ?
- Can we use IOKit for iOS?
- null is not an object (evaluating 'UsbSerialModule.getDeviceListAsync')
- No interface method pushMap HOT 5
- NPM package 404 HOT 2
- Package build error when running react-native HOT 9
- undefined is not a constructor HOT 7
- Direct raw message without Drivers?
- No available drivers to communicate with devices HOT 2
- overrideLibrary address in manifest.xml
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from react-native-usbserial.