/// <summary>
/// Open the serial port.
/// </summary>
Task IPort.OpenAsync(PortConfiguration configuration)
{
// Clean up the existing SerialPort object, if we have one.
if (this.port != null)
{
this.port.Dispose();
}
SerialPortConfiguration config = configuration as SerialPortConfiguration;
this.port = new SerialPort(this.name);
this.port.BaudRate = config.BaudRate;
this.port.DataBits = 8;
this.port.Parity = Parity.None;
this.port.StopBits = StopBits.One;
if (config.Timeout == 0)
{
config.Timeout = 1000; // default to 1 second but allow override.
}
this.port.ReadTimeout = config.Timeout;
if (config.DataReceived != null)
{
this.dataReceivedCallback = config.DataReceived;
this.port.DataReceived += this.DataReceived;
}
this.port.Open();
// This line must come AFTER the call to port.Open().
// Attempting to use the BaseStream member will throw an exception otherwise.
//
// However, even after setting the BaseStream.ReadTimout property, calls to
// BaseStream.ReadAsync will hang indefinitely. It turns out that you have
// to implement the timeout yourself if you use the async approach.
this.port.BaseStream.ReadTimeout = this.port.ReadTimeout;
return(Task.CompletedTask);
}
public override async Task <bool> Initialize()
{
this.Logger.AddDebugMessage("Initializing " + this.ToString());
Response <Message> m;
SerialPortConfiguration configuration = new SerialPortConfiguration();
configuration.BaudRate = 115200;
await this.Port.OpenAsync(configuration);
await this.Port.DiscardBuffers();
this.Logger.AddDebugMessage("Sending 'reset' message.");
await this.Port.Send(AvtDevice.AVT_RESET.GetBytes());
m = await this.FindResponse(AVT_852_IDLE);
if (m.Status == ResponseStatus.Success)
{
this.Logger.AddUserMessage("AVT device reset ok");
}
else
{
this.Logger.AddUserMessage("AVT device not found or failed reset");
this.Logger.AddDebugMessage("Expected " + AvtDevice.AVT_852_IDLE.GetString());
return(false);
}
this.Logger.AddDebugMessage("Looking for Firmware message");
m = await this.FindResponse(AVT_FIRMWARE);
if (m.Status == ResponseStatus.Success)
{
byte firmware = m.Value.GetBytes()[1];
int major = firmware >> 4;
int minor = firmware & 0x0F;
this.Logger.AddUserMessage("AVT Firmware " + major + "." + minor);
}
else
{
this.Logger.AddUserMessage("Firmware not found or failed reset");
this.Logger.AddDebugMessage("Expected " + AVT_FIRMWARE.GetBytes());
return(false);
}
await this.Port.Send(AvtDevice.AVT_ENTER_VPW_MODE.GetBytes());
m = await FindResponse(AVT_VPW);
if (m.Status == ResponseStatus.Success)
{
this.Logger.AddDebugMessage("Set VPW Mode");
}
else
{
this.Logger.AddUserMessage("Unable to set AVT device to VPW mode");
this.Logger.AddDebugMessage("Expected " + AvtDevice.AVT_VPW.GetString());
return(false);
}
await AVTSetup();
return(true);
}
public override async Task <bool> Initialize()
{
this.Logger.AddDebugMessage("Initializing " + this.ToString());
Response <Message> m;
SerialPortConfiguration configuration = new SerialPortConfiguration();
configuration.BaudRate = 115200;
await this.Port.OpenAsync(configuration);
await this.Port.DiscardBuffers();
this.Logger.AddDebugMessage("Sending 'reset' message.");
await this.Port.Send(AvtDevice.AVT_RESET.GetBytes());
m = await ReadAVTPacket();
if (m.Status == ResponseStatus.Success)
{
switch (m.Value.GetBytes()[0])
{
case 0x27:
this.Logger.AddUserMessage("AVT 852 Reset OK");
break;
case 0x12:
this.Logger.AddUserMessage("AVT 842 Reset OK");
break;
default:
this.Logger.AddUserMessage("Unknown and unsupported AVT device detected. Please add support and submit a patch!");
return(false);
}
}
else
{
this.Logger.AddUserMessage("AVT device not found or failed reset");
return(false);
}
this.Logger.AddDebugMessage("Looking for Firmware message");
m = await this.FindResponse(AVT_FIRMWARE);
if (m.Status == ResponseStatus.Success)
{
byte firmware = m.Value.GetBytes()[1];
int major = firmware >> 4;
int minor = firmware & 0x0F;
this.Logger.AddUserMessage("AVT Firmware " + major + "." + minor);
}
else
{
this.Logger.AddUserMessage("Firmware not found or failed reset");
this.Logger.AddDebugMessage("Expected " + AVT_FIRMWARE.GetBytes());
return(false);
}
await this.Port.Send(AvtDevice.AVT_ENTER_VPW_MODE.GetBytes());
m = await FindResponse(AVT_VPW);
if (m.Status == ResponseStatus.Success)
{
this.Logger.AddDebugMessage("Set VPW Mode");
}
else
{
this.Logger.AddUserMessage("Unable to set AVT device to VPW mode");
this.Logger.AddDebugMessage("Expected " + AvtDevice.AVT_VPW.GetString());
return(false);
}
await AVTSetup();
return(true);
}
/// <summary>
/// Run the HTTP server. Just handle requests as they come in.
/// </summary>
public async void Run(object unused)
{
// This loop restarts the server if it crashes.
while (true)
{
try
{
this.listener = new HttpListener();
this.listener.Prefixes.Add("http://*:11411/pcm/");
this.listener.Start();
SerialPortConfiguration configuration = new SerialPortConfiguration();
configuration.BaudRate = 115200;
await this.port.OpenAsync(configuration);
// This loop handles incoming connections.
while (true)
{
var context = await this.listener.GetContextAsync();
context.Response.ContentType = "text/plain";
try
{
string path = context.Request.Url.AbsolutePath;
if (path == "/pcm/send")
{
await this.Send(context);
}
else if (path == "/pcm/receive")
{
await this.Receive(context);
}
else
{
var writer = new StreamWriter(context.Response.OutputStream);
await writer.WriteLineAsync("Unsupported URL path");
context.Response.StatusCode = 404;
}
}
catch (TimeoutException)
{
context.Response.StatusCode = 504;
}
catch (Exception exception)
{
this.logger.AddUserMessage("HTTP 500 " + exception.ToString());
var writer = new StreamWriter(context.Response.OutputStream);
context.Response.StatusCode = 500;
await writer.WriteLineAsync(exception.ToString());
await writer.FlushAsync();
}
context.Response.Close();
}
}
catch (Exception exception)
{
this.logger.AddUserMessage("The web server crashed. Will restart in 5 seconds.");
this.logger.AddUserMessage(exception.ToString());
if (this.listener != null)
{
this.listener.Close();
this.listener = null;
}
if (this.port != null)
{
this.port.Dispose();
this.port = null;
}
await Task.Delay(5000);
}
}
}
/// <summary>
/// Configure the device for use - and also confirm that the device is what we think it is.
/// </summary>
public override async Task <bool> Initialize()
{
this.Logger.AddDebugMessage("Initializing " + this.ToString());
// We're going to reset the interface device, which means that it's going
// to forgot what header the app previously told it to use. That requires
// the app to forget what header the interface was told to use - that will
// cause the app to send another set-header command later on.
this.currentHeader = "header not yet set";
SerialPortConfiguration configuration = new SerialPortConfiguration();
configuration.BaudRate = 115200;
configuration.Timeout = 1200;
await this.Port.OpenAsync(configuration);
await this.Port.DiscardBuffers();
try
{
// Reset
await this.SendRequest(""); // send a cr/lf to prevent the ATZ failing.
this.Logger.AddDebugMessage(await this.SendRequest("AT Z")); // reset
this.Logger.AddDebugMessage(await this.SendRequest("AT E0")); // disable echo
this.Logger.AddDebugMessage(await this.SendRequest("AT S0")); // no spaces on responses
// Device Identification
string elmID = await this.SendRequest("AT I"); // Identify (ELM)
string stID = await this.SendRequest("ST I"); // Identify (ScanTool.net)
string apID = await this.SendRequest("AT #1"); // Identify (AllPro)
if (elmID != "?")
{
this.Logger.AddUserMessage("Elm ID: " + elmID);
if (elmID.Contains("ELM327 v1.5"))
{
// TODO: Add a URL to a web page with a list of supported devices.
// No such web page exists yet, but I'm sure we'll create one some day...
this.Logger.AddUserMessage("ERROR: This OBD2 interface is not supported.");
return(false);
}
}
if (stID != "?")
{
this.Logger.AddUserMessage("ScanTool ID: " + stID);
}
if (apID != "?")
{
this.Logger.AddUserMessage("All Pro ID: " + apID);
this.Logger.AddUserMessage("All Pro self test result: " + await this.SendRequest("AT #3")); // self test
this.Logger.AddUserMessage("All Pro firmware: " + await this.SendRequest("AT @1")); // firmware check
this.Supports4X = true;
this.MaxSendSize = 2048 + 12;
this.MaxReceiveSize = 2048 + 12;
}
string voltage = await this.SendRequest("AT RV"); // Get Voltage
this.Logger.AddUserMessage("Voltage: " + voltage);
if (!await this.SendAndVerify("AT AL", "OK") || // Allow Long packets
!await this.SendAndVerify("AT SP2", "OK") || // Set Protocol 2 (VPW)
!await this.SendAndVerify("AT DP", "SAE J1850 VPW") || // Get Protocol (Verify VPW)
!await this.SendAndVerify("AT AR", "OK") || // Turn Auto Receive on (default should be on anyway)
!await this.SendAndVerify("AT AT0", "OK") || // Disable adaptive timeouts
!await this.SendAndVerify("AT SR " + DeviceId.Tool.ToString("X2"), "OK") || // Set receive filter to this tool ID
!await this.SendAndVerify("AT H1", "OK") || // Send headers
!await this.SendAndVerify("AT ST 20", "OK") // Set timeout (will be adjusted later, too)
)
{
return(false);
}
}
catch (Exception exception)
{
this.Logger.AddDebugMessage("Unable to initalize " + this.ToString());
this.Logger.AddDebugMessage(exception.ToString());
return(false);
}
return(true);
}