internal WifiSetRequest(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload)
: base(CategoryIdType.WifiControl, (ushort)wifiRequestType, sequenceId, payload, 4)
{
/* Data format:
*
* - 00 [ 1 ] Operation result - 0x00 success, > 0x00 is error code
* - 01 [ 3 ] Reserved
*/
this.ErrorCode = payload[0];
}
internal WifiScanSummaryRequest(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload)
: base(CategoryIdType.WifiControl, (ushort)wifiRequestType, sequenceId, payload, 8)
{
/* Data format:
*
* - 00 [ 1 ] Scan result - 0x00 success, > 0x00 is error code
* - 01 [ 1 ] Total network count
* - 02 [ 2 ] Reserved
* - 04 [ 4 ] Total results size - the number of bytes needed to store scan results
*/
ErrorCode = payload[0];
NetworkCount = payload[1];
}
internal RequestBase(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload, int expectedPayloadLength)
{
if (payload == null && expectedPayloadLength != 0)
{
throw new ArgumentNullException(nameof(payload), "Payload should not be null.");
}
if (payload != null && payload.Length != expectedPayloadLength)
{
throw new ArgumentOutOfRangeException(nameof(payload), $"Payload should be {expectedPayloadLength} bytes. It is {payload.Length}.");
}
WifiRequestType = wifiRequestType;
SequenceId = sequenceId;
}
internal WifiScanResultRequest(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload)
: base(wifiRequestType, sequenceId, payload, 36)
{
/* Data format:
*
* - 00 [ 1 ] Security type
* - 01 [ 1 ] WiFi signal level - RSSI range from -128 to 0
* - 02 [ 1 ] SSID length
* - 03 [ 1 ] Reserved
* - 04 [ 32 ] SSID
*/
SecurityType = (SecurityType)payload[0];
SignalStrength = ByteArrayHelper.ReadSignedByte(payload, 1);
Ssid = ByteArrayHelper.ReadBytes(payload, 4, payload[2]);
}
private static RequestBase ExtractRequestPayload(CategoryIdType categoryId, ushort requestType, uint sequenceId, byte[] payload)
{
switch (categoryId)
{
case CategoryIdType.DeviceControl:
DeviceControlRequestId deviceControlRequestId = (DeviceControlRequestId)requestType;
switch (deviceControlRequestId)
{
case DeviceControlRequestId.GetDesiredLedStatus:
return(new DeviceControlGetDesiredLedStatusRequest(deviceControlRequestId, sequenceId));
case DeviceControlRequestId.ReportLedStatus:
return(new DeviceControlReportLedStatusRequest(deviceControlRequestId, sequenceId, payload));
default:
throw new InvalidOperationException($"Unknown response payload type: {(WifiRequestId)requestType}");
}
case CategoryIdType.WifiControl:
WifiRequestId wifiRequestId = (WifiRequestId)requestType;
switch (wifiRequestId)
{
case WifiRequestId.SetWifiStatus:
return(new WifiStatusRequest(wifiRequestId, sequenceId, payload));
case WifiRequestId.SetWifiScanResultsSummary:
return(new WifiScanSummaryRequest(wifiRequestId, sequenceId, payload));
case WifiRequestId.SetNextWifiScanResult:
return(new WifiScanResultRequest(wifiRequestId, sequenceId, payload));
case WifiRequestId.GetNewWifiDetails:
// This request doesn't have a payload
return(new WifiGetNewDetailsRequest(wifiRequestId, sequenceId));
case WifiRequestId.SetWifiOperationResult:
return(new WifiSetRequest(wifiRequestId, sequenceId, payload));
default:
throw new InvalidOperationException($"Unknown response payload type: {wifiRequestId}");
}
default:
throw new InvalidOperationException($"Unknown Category ID type: {categoryId}");
}
}
public static byte[] CreateResponseMessage(WifiRequestId wifiRequestType, uint sequenceId, byte errorCode, ResponseBase response = null)
{
// Handle response object if provided...
byte[] payload = new byte[0];
if (response != null)
{
payload = response.GetPayload();
}
/* Response format:
*
* | Offset Bytes | 0 | 1 | 2 | 3 |
* | 0 | Preamble |
* | 4 | Length | Msg Type | Reserved |
* | 8 | Category ID | Request ID |
* | 12 | Sequence Number | Result | Reserved |
* | 16 | <Response Data> |
* | ... | ... |
*
* Length : UINT16 (LSB) - the message length excluding the first 6 bytes.
*
* Sequence number : UINT16 (LSB) - must be the same as the sequence number of the
* request this is answering.
*
* Result : 0x00 if successful, > 0x00 as an error code if failed
*/
byte[] message = new byte[16 + payload.Length];
ByteArrayHelper.WriteBytes(Preamble, message);
ByteArrayHelper.WriteLsbUInt16((ushort)(10 + payload.Length), message, 4);
message[6] = (byte)MessageType.Response;
ByteArrayHelper.WriteLsbUInt16((ushort)CategoryId.WifiControl, message, 8);
ByteArrayHelper.WriteLsbUInt16((ushort)wifiRequestType, message, 10);
ByteArrayHelper.WriteLsbUInt16((ushort)sequenceId, message, 12);
message[14] = errorCode;
ByteArrayHelper.WriteBytes(payload, message, 16);
return(message);
}
internal WifiStatusRequest(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload)
: base(CategoryIdType.WifiControl, (ushort)wifiRequestType, sequenceId, payload, 48)
{
/* Data format:
*
* - 00 [ 1 ] WiFi connection status - 0x00 : WiFi connected, 0x01 : Internet connected
* - 01 [ 1 ] WiFi signal level - RSSI range from -128 to 0
* - 02 [ 1 ] Security type
* - 03 [ 1 ] SSID length
* - 04 [ 32 ] SSID
* - 36 [ 4 ] WiFi frequency - UInt32 in MHz
* - 40 [ 6 ] BSSID
* - 46 [ 2 ] Reserved
*/
IsWifiConnected = (payload[0] & 0x01) == 0x01;
IsInternetConnected = (payload[0] & 0x02) == 0x02;
SignalStrength = ByteArrayHelper.ReadSignedByte(payload, 1);
SecurityType = (SecurityType)payload[2];
Ssid = ByteArrayHelper.ReadBytes(payload, 4, payload[3]);
FrequencyMhz = ByteArrayHelper.ReadLsbUInt32(payload, 36);
Bssid = ByteArrayHelper.ReadDelimitedHex(payload, 40, 6, ':');
}
public static RequestBase ReadRequestMessagePayload(byte[] message)
{
if (message.Length < 16)
{
throw new ArgumentOutOfRangeException(nameof(message), $"Message should be at least 16 bytes, not {message.Length}.");
}
/* Request format:
*
* | Offset Bytes | 0 | 1 | 2 | 3 |
* | 0 | Preamble |
* | 4 | Length | Msg Type | Reserved |
* | 8 | Category ID | Request ID |
* | 12 | Sequence Number | Reserved |
* | 16 | <Request Data> |
* | ... | ... |
*
* Length : UINT16 (LSB) - the message length excluding the first 6 bytes.
*
* Sequence number : UINT16 (LSB) - must be used for the response to this request.
*/
uint length = ByteArrayHelper.ReadLsbUInt16(message, 4);
WifiRequestId wifiRequestType = (WifiRequestId)ByteArrayHelper.ReadLsbUInt16(message, 10);
uint sequenceId = ByteArrayHelper.ReadLsbUInt16(message, 12);
byte[] payload = null;
uint payloadLength = length - 10;
if (payloadLength > 0)
{
payload = ByteArrayHelper.ReadBytes(message, 16, payloadLength);
}
return(ExtractRequestPayload(wifiRequestType, sequenceId, payload));
}
private static RequestBase ExtractRequestPayload(WifiRequestId wifiRequestType, uint sequenceId, byte[] payload)
{
switch (wifiRequestType)
{
case WifiRequestId.SetWifiStatus:
return(new WifiStatusRequest(wifiRequestType, sequenceId, payload));
case WifiRequestId.SetWifiScanResultsSummary:
return(new WifiScanSummaryRequest(wifiRequestType, sequenceId, payload));
case WifiRequestId.SetNextWifiScanResult:
return(new WifiScanResultRequest(wifiRequestType, sequenceId, payload));
case WifiRequestId.GetNewWifiDetails:
// This request doesn't have a payload
return(new WifiGetNewDetailsRequest(wifiRequestType, sequenceId));
case WifiRequestId.SetWifiOperationResult:
return(new WifiSetRequest(wifiRequestType, sequenceId, payload));
default:
throw new InvalidOperationException($"Unknown response payload type: {wifiRequestType}");
}
}
internal WifiGetNewDetailsRequest(WifiRequestId wifiRequestType, uint sequenceId)
: base(wifiRequestType, sequenceId, null, 0)
{
// This request type doesn't have a payload.
}
internal WifiGetNewDetailsRequest(WifiRequestId wifiRequestType, uint sequenceId)
: base(CategoryIdType.WifiControl, (ushort)wifiRequestType, sequenceId, null, 0)
{
// This request type doesn't have a payload.
}
