protected async Task ReceiveOkAnswer()
{
var answer = await CommHelper.ReceiveAnswer();
if (answer.ansType != AnsType.Ok)
{
throw new Exception($"Received non OK answer: {answer.ansType}");
}
if (answer.seq != ansLCG.GenerateValue())
{
throw new Exception("Sequence number mismatch in OK answer");
}
}
protected async Task <IOTPResponse> ExecuteCommand(IOTPCommand command)
{
//send Command-begin request with command type
await CommHelper.SendRequest(ReqType.Command, reqLCG.GenerateValue(), new byte[1] {
command.CommandType
}, 0, 1);
//receive OK answer
await ReceiveOkAnswer();
//transfer command-data
var cmdData = command.SerializedData;
var dataLeft = cmdData.Length;
while (dataLeft > 0)
{
var dataLen = dataLeft;
if (dataLen > Config.CMD_MAX_PLSZ)
{
dataLen = Config.CMD_MAX_PLSZ;
}
//send CommandData request
await CommHelper.SendRequest(ReqType.CommandData, reqLCG.GenerateValue(), cmdData, cmdData.Length - dataLeft, dataLen);
//receive OK answer
await ReceiveOkAnswer();
dataLeft -= dataLen;
}
PreCommandCommit();
//send Command-commit request
await CommHelper.SendRequest(ReqType.Command, reqLCG.GenerateValue(), new byte[1] {
0
}, 0, 1);
//receive OK answer
await ReceiveOkAnswer();
PostCommandCommit();
//request response from device
await CommHelper.SendRequest(ReqType.DataRequest, reqLCG.GenerateValue(), new byte[1] {
0
}, 0, 1);
//receive dataMarker answer, that contains information about pending response
var answer = await CommHelper.ReceiveAnswer();
if (answer.ansType != AnsType.DataMarker)
{
throw new Exception($"Received non DataMarker answer: {answer.ansType}");
}
if (answer.seq != ansLCG.GenerateValue())
{
throw new Exception("Sequence number mismatch in DataMarker answer");
}
var respType = answer.payload[0];
//receive data fragments
var totalResponseSz = 0;
var responseFragments = new List <byte[]>();
while (totalResponseSz < Config.MAX_RESPONSE_SZ)
{
//request response-data from device
await CommHelper.SendRequest(ReqType.DataRequest, reqLCG.GenerateValue(), new byte[1] {
1
}, 0, 1);
//receive answer, that contains data chunk
answer = await CommHelper.ReceiveAnswer();
if (answer.ansType != AnsType.Data)
{
throw new Exception($"Received non Data answer: {answer.ansType}");
}
if (answer.seq != ansLCG.GenerateValue())
{
throw new Exception("Sequence number mismatch in DataMarker answer");
}
//generate response=object
if (answer.payload.Length == 0)
{
var serializedData = new byte[totalResponseSz];
var serializedPos = 0;
foreach (var frag in responseFragments)
{
Buffer.BlockCopy(frag, 0, serializedData, serializedPos, frag.Length);
serializedPos += frag.Length;
}
return(ResponseHelper.DeserializeResponse(respType, serializedData));
}
responseFragments.Add(answer.payload);
totalResponseSz += answer.payload.Length;
}
throw new Exception("Response data size reached!");
}