Iot: I2cDevice Write fails

[johndcollins]

I'm trying to use the following device on a Raspberry Pi 3:
https://wiki.52pi.com/index.php/DockerPi_4_Channel_Relay_SKU:_EP-0099

I'm able to turn on and off the relay with this command on the RPi itself no problem:
i2cset -y 1 0x10 0x01 0xFF
i2cset -y 1 0x10 0x01 0x00

I'm able to connect to the device, but when I try to write to it I get the following error:
"Error 121 performing I2C data transfer."
Stack Trace:
System.IO.IOException: Error 121 performing I2C data transfer.
at System.Device.I2c.UnixI2cDevice.ReadWriteInterfaceTransfer(Byte* writeBuffer, Byte* readBuffer, Int32 writeBufferLength, Int32 readBufferLength)
at System.Device.I2c.UnixI2cDevice.Transfer(Byte* writeBuffer, Byte* readBuffer, Int32 writeBufferLength, Int32 readBufferLength)
at System.Device.I2c.UnixI2cDevice.Write(ReadOnlySpan`1 value)

Steps to reproduce
According the the Wiki I can turn on relay 1 by sending 0x10 0x01 0xFF
The description of Write function says to not send the ID, so I've tried with and without the 0x10
Both gave me the error.

I2cConnectionSettings conn = new I2cConnectionSettings(1, 10);
I2cDevice myDevice = I2cDevice.Create(conn);
byte[] data = { 0x01, 0xFF }; // Or byte[] data = { 0x10, 0x01, 0xFF }; both fails
myDevice.Write(data);

Expected behavior
I'd expect it to turn on relay number 1

Actual behavior
Error Exception

Versions used
.Net Core 3.0
System.Device.Gpio 1.0.0

Add following information:

• dotnet --info on the machine being used to build
  .NET Core SDK (reflecting any global.json):
  Version: 3.0.100
  Commit: 04339c3a26

Runtime Environment:
OS Name: Windows
OS Version: 10.0.18362
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.0.100\

Host (useful for support):
Version: 3.0.0
Commit: 7d57652f33

.NET Core SDKs installed:
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.503 [C:\Program Files\dotnet\sdk]
2.1.504 [C:\Program Files\dotnet\sdk]
2.1.505 [C:\Program Files\dotnet\sdk]
2.1.508 [C:\Program Files\dotnet\sdk]
2.1.509 [C:\Program Files\dotnet\sdk]
2.1.602 [C:\Program Files\dotnet\sdk]
2.1.801 [C:\Program Files\dotnet\sdk]
2.2.104 [C:\Program Files\dotnet\sdk]
2.2.401 [C:\Program Files\dotnet\sdk]
3.0.100 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

• dotnet --info on the machine where app is being run (not applicable for self-contained apps)
  .NET Core SDK (reflecting any global.json):
  Version: 3.0.100
  Commit: 04339c3a26

Runtime Environment:
OS Name: raspbian
OS Version: 10
OS Platform: Linux
RID: linux-arm
Base Path: /home/pi/dotnet/sdk/3.0.100/

Host (useful for support):
Version: 3.0.0
Commit: 95a0a61858

.NET Core SDKs installed:
3.0.100 [/home/pi/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.0.0 [/home/pi/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.0.0 [/home/pi/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

• Version of System.Device.Gpio package
  1.0.0

• Version of Iot.Device.Bindings package (not needed if bug is in System.Device.Gpio)

[krwq]

Looking at the issue description it sounds like you should use:
new I2cConnectionSettings(1, 0x10); instead of new I2cConnectionSettings(1, 10);

[johndcollins]

Thanks!
Yea, missed that. The parameter is an integer, should of cause have been a 16...