// safety check to make sure an expected 0x81 response is received before next expected 0x80 response
// very infrequent as clearMessage catches most issues but very important to save a CNL error situation
protected async Task <byte[]> ReadMessage_0x81(UsbHidDriver mDevice, int timeout = READ_TIMEOUT_MS)
{
byte[] responseBytes;
bool doRetry;
var expected = (byte)0x81;
do
{
responseBytes = await ReadMessage(mDevice, timeout);
var actual = responseBytes[18];
if (actual != expected)
{
doRetry = true;
Log.d(TAG, "readMessage0x81: did not get 0x81 response, got " + HexDump.ToHexstring(actual));
MedtronicCnlService.cnl0x81++;
}
else
{
doRetry = false;
break;
}
} while (doRetry);
return(responseBytes);
}
protected async Task <byte[]> ReadFromPump(UsbHidDriver mDevice, MedtronicCnlSession pumpSession, string tag)
{
tag = " (" + tag + ")";
MultipacketSession multipacketSession = null;
byte[] tupple;
byte[] payload = null;
byte[] decrypted = null;
bool fetchMoreData = true;
int retry = 0;
int expectedSegments = 0;
int cmd;
while (fetchMoreData)
{
if (multipacketSession != null)
{
do
{
if (expectedSegments < 1)
{
tupple = multipacketSession.MissingSegments();
new MultipacketResendPacketsMessage(pumpSession, tupple).send(mDevice);
expectedSegments = read16BEtoUInt(tupple, 0x02);
}
try
{
payload = await ReadMessage(mDevice, MULTIPACKET_TIMEOUT_MS);
break;
}
catch (TimeoutException e)
{
if (++retry >= SEGMENT_RETRY)
{
throw new TimeoutException("Timeout waiting for response from pump (multipacket)" + tag);
}
Log.d(TAG, "*** Multisession timeout, expecting:" + expectedSegments + " retry: " + retry);
expectedSegments = 0;
}
} while (retry > 0);
}
else
{
try
{
payload = await ReadMessage(mDevice, READ_TIMEOUT_MS);
}
catch (TimeoutException e)
{
throw new TimeoutException("Timeout waiting for response from pump" + tag);
}
}
if (payload.Length < 0x0039)
{
Log.d(TAG, "*** bad response" + HexDump.DumpHexstring(payload, 0x12, payload.Length - 0x14));
fetchMoreData = true;
}
else
{
decrypted = Decode(pumpSession, payload);
cmd = read16BEtoUInt(decrypted, RESPONSE_COMMAND);
Log.d(TAG, "CMD: " + HexDump.ToHexstring(cmd));
if (MedtronicSendMessageRequestMessage.MessageType.EHSM_SESSION.response(cmd))
{
// EHSM_SESSION(0)
Log.d(TAG, "*** EHSM response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = true;
}
else if (MedtronicSendMessageRequestMessage.MessageType.NAK_COMMAND.response(cmd))
{
Log.d(TAG, "*** NAK response" + HexDump.DumpHexstring(decrypted));
ClearMessage(mDevice, ERROR_CLEAR_TIMEOUT_MS);
// if multipacket was in progress we may need to clear 2 EHSM_SESSION(1) messages from pump
short nakcmd = read16BEtoShort(decrypted, 3);
byte nakcode = decrypted[5];
throw new UnexpectedMessageException("Pump sent a NAK(" + string.Format("%02X", nakcmd) + ":" + string.Format("%02X", nakcode) + ") response" + tag);
}
else if (MedtronicSendMessageRequestMessage.MessageType.INITIATE_MULTIPACKET_TRANSFER.response(cmd))
{
multipacketSession = new MultipacketSession(decrypted);
new AckMessage(pumpSession, MedtronicSendMessageRequestMessage.MessageType.INITIATE_MULTIPACKET_TRANSFER.response()).send(mDevice);
expectedSegments = multipacketSession.PacketsToFetch;
fetchMoreData = true;
}
else if (MedtronicSendMessageRequestMessage.MessageType.MULTIPACKET_SEGMENT_TRANSMISSION.response(cmd))
{
if (multipacketSession == null)
{
throw new UnexpectedMessageException("multipacketSession not initiated before segment received" + tag);
}
multipacketSession.AddSegment(decrypted);
expectedSegments--;
if (multipacketSession.PayloadComplete)
{
Log.d(TAG, "*** Multisession Complete");
new AckMessage(pumpSession, MedtronicSendMessageRequestMessage.MessageType.MULTIPACKET_SEGMENT_TRANSMISSION.response()).send(mDevice);
// read 0412 = EHSM_SESSION(1)
payload = await ReadMessage(mDevice, READ_TIMEOUT_MS);
decrypted = Decode(pumpSession, payload);
Log.d(TAG, "*** response" + HexDump.DumpHexstring(decrypted));
return(multipacketSession.Response);
}
else
{
fetchMoreData = true;
}
}
else if (MedtronicSendMessageRequestMessage.MessageType.END_HISTORY_TRANSMISSION.response(cmd))
{
Log.d(TAG, "*** END_HISTORY_TRANSMISSION response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_PUMP_TIME.response(cmd))
{
Log.d(TAG, "*** READ_PUMP_TIME response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_PUMP_STATUS.response(cmd))
{
Log.d(TAG, "*** READ_PUMP_STATUS response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_HISTORY_INFO.response(cmd))
{
Log.d(TAG, "*** READ_HISTORY_INFO response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_BASAL_PATTERN.response(cmd))
{
Log.d(TAG, "*** READ_BASAL_PATTERN response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_BOLUS_WIZARD_CARB_RATIOS.response(cmd))
{
Log.d(TAG, "*** READ_BOLUS_WIZARD_CARB_RATIOS response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_BOLUS_WIZARD_SENSITIVITY_FACTORS.response(cmd))
{
Log.d(TAG, "*** READ_BOLUS_WIZARD_SENSITIVITY_FACTORS response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else if (MedtronicSendMessageRequestMessage.MessageType.READ_BOLUS_WIZARD_BG_TARGETS.response(cmd))
{
Log.d(TAG, "*** READ_BOLUS_WIZARD_BG_TARGETS response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = false;
}
else
{
Log.d(TAG, "*** ??? response" + HexDump.DumpHexstring(decrypted));
fetchMoreData = true;
}
}
}
// when returning non-multipacket decrypted data, we need to trim the 2 byte checksum
if (decrypted == null)
{
return(payload);
}
return(decrypted.Partial(0, decrypted.Length - 2));
}