/// <summary>
/// Used for writing blobs
/// </summary>
/// <param name="ch">The characteristic to write on</param>
/// <param name="stream">The stream to send</param>
public static IObservable <BleWriteSegment> BlobWrite(this IGattCharacteristic ch, Stream stream) => Observable.Create <BleWriteSegment>(async(ob, ct) =>
{
var trans = ch.Service.Peripheral.TryBeginTransaction() ?? new VoidGattReliableWriteTransaction();
using (trans)
{
var mtu = ch.Service.Peripheral.MtuSize;
var buffer = new byte[mtu];
var read = stream.Read(buffer, 0, buffer.Length);
var pos = read;
var len = Convert.ToInt32(stream.Length);
while (!ct.IsCancellationRequested && read > 0)
{
await trans
.Write(ch, buffer)
.ToTask(ct)
.ConfigureAwait(false);
//if (this.Value != buffer)
//{
// trans.Abort();
// throw new GattReliableWriteTransactionException("There was a mismatch response");
//}
var seg = new BleWriteSegment(buffer, pos, len);
ob.OnNext(seg);
read = stream.Read(buffer, 0, buffer.Length);
pos += read;
}
await trans.Commit();
}
ob.OnCompleted();
return(trans);
});
/// <summary>
/// Used for writing blobs
/// </summary>
/// <param name="ch">The characteristic to write on</param>
/// <param name="stream">The stream to send</param>
/// <param name="packetSendTimeout">How long to wait before timing out a packet send - defaults to 5 seconds</param>
public static IObservable <BleWriteSegment> WriteBlobWithProgress(this IGattCharacteristic ch, Stream stream, TimeSpan?packetSendTimeout = null) => Observable.Create <BleWriteSegment>(async(ob, ct) =>
{
var mtu = ch.Service.Peripheral.MtuSize;
var buffer = new byte[mtu];
var read = stream.Read(buffer, 0, buffer.Length);
var pos = read;
var len = Convert.ToInt32(stream.Length);
var remaining = 0;
var timeout = packetSendTimeout ?? TimeSpan.FromSeconds(5);
while (!ct.IsCancellationRequested && read > 0)
{
await ch
.Write(buffer)
.Timeout(timeout)
.ToTask(ct)
.ConfigureAwait(false);
//if (this.Value != buffer)
//{
// trans.Abort();
// throw new GattReliableWriteTransactionException("There was a mismatch response");
//}
var seg = new BleWriteSegment(buffer, pos, len);
ob.OnNext(seg);
remaining = len - pos;
if (remaining > 0 && remaining < mtu)
{
// readjust buffer -- we don't want to send extra garbage
buffer = new byte[remaining];
}
read = stream.Read(buffer, 0, buffer.Length);
pos += read;
}
ob.OnCompleted();
return(Disposable.Empty);
});
