PN532 binding does not work correctly when configured "AsTarget"

The physical device is a PN532 board from Elechouse similar to [this one](https://www.elechouse.com/elechouse/images/product/PN532_module_V3/PN532_%20Manual_V3.pdf)

The code used to test the device (with a Raspberry PI) is [the one published at the binding page](https://github.com/dotnet/iot/blob/a0db92f8c766771434095662ce2a0c0e47bec24c/src/devices/Pn532/README.md#pn532-as-a-target)

The nuget packages in the test project are the following:
```




```

I made the tests using both the I2C and the RS232 connections. In both cases the communication breaks:
- the I2C communication breaks and the device needs to be reset before re-testing it
- the RS232 communication breaks after a while but still shows a timeout communication error

**Log using the I2C**
```
Mifare
08-00-00-00-00-60
feliCa
01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF
picc
AA-99-88-77-66-55-44-33-22-11-00-00
Before WriteCommand(TgInitAsTarget)WriteCommand: CommandSet TgInitAsTarget
Bytes to send: 04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00
W> 00-FF-27-D9-D4-8C-04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00-99
Before ReadResponse(TgInitAsTarget)WriteCommand: CommandSet SetParameters
Bytes to send: 20
W> 00-FF-03-FD-D4-12-20-FA
Mifare
08-00-00-00-00-60
feliCa
01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF
picc
AA-99-88-77-66-55-44-33-22-11-00-00
Before WriteCommand(TgInitAsTarget)WriteCommand: CommandSet TgInitAsTarget
Bytes to send: 04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00
W> 00-FF-27-D9-D4-8C-04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00-99
Before ReadResponse(TgInitAsTarget)WriteCommand: CommandSet SetParameters
Bytes to send: 20
W> 00-FF-03-FD-D4-12-20-FA
Mifare
08-00-00-00-00-60
feliCa
01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF
picc
AA-99-88-77-66-55-44-33-22-11-00-00
Before WriteCommand(TgInitAsTarget)WriteCommand: CommandSet TgInitAsTarget
Bytes to send: 04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00
W> 00-FF-27-D9-D4-8C-04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00-99
Before ReadResponse(TgInitAsTarget)Unhandled exception. System.IO.IOException: Error 5 performing I2C data transfer.  
at System.Device.I2c.UnixI2cBus.WriteReadCore(UInt16 deviceAddress, Byte* writeBuffer, Byte* readBuffer, UInt16 writeBufferLength, UInt16 readBufferLength)   at System.Device.I2c.UnixI2cBus.Read(Int32 deviceAddress, Span`1 buffer)  
at TestNfc.Pn532.ReadResponseI2C(CommandSet commandSet, Span`1 readData) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Pn532.cs:line 2000  
at TestNfc.Pn532.InitAsTarget(TargetModeInitialization mode, TargetMifareParameters mifare, TargetFeliCaParameters feliCa, TargetPiccParameters picc) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Pn532.cs:line 923  
at TestNfc.Program.AsTarget(Pn532 pn532) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 68  
at TestNfc.Program.Start() in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 59  
at TestNfc.Program.Main(String[] args) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 25
Aborted
```

**Log using the RS232**
```
01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FFpiccAA-99-88-77-66-55-44-33-22-11-00-00
Before WriteCommand(TgInitAsTarget)WriteCommand: CommandSet TgInitAsTarget Bytes to send: 04-08-00-00-00-00-60-01-FE-A2-A3-A4-A5-A6-A7-C0-C1-C2-C3-C4-C5-C6-C7-FF-FF-AA-99-88-77-66-55-44-33-22-11-00-00
Before ReadResponse(TgInitAsTarget)
Unhandled exception. System.TimeoutException: The operation has timed out.   at System.IO.Ports.SerialStream.Read(Byte[] array, Int32 offset, Int32 count, Int32 timeout)  
at System.IO.Ports.SerialPort.ReadByte()  
at TestNfc.Pn532.ReadResponseSerial(CommandSet commandSet, Span`1 readData) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Pn532.cs:line 1786  
at TestNfc.Pn532.ReadResponse(CommandSet commandSet, Span`1 readData) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Pn532.cs:line 1747  
at TestNfc.Pn532.InitAsTarget(TargetModeInitialization mode, TargetMifareParameters mifare, TargetFeliCaParameters feliCa, TargetPiccParameters picc) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Pn532.cs:line 932  
at TestNfc.Program.AsTarget(Pn532 pn532) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 70  
at TestNfc.Program.Start() in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 61  
at TestNfc.Program.Main(String[] args) in H:\dev.git\libraries\SipLibrary\src\SipLibrarySolution\TestNfc\Program.cs:line 26
Aborted
```

The logs have been instrumented with additional `Console.WriteLine`. This caused the slow to exhibit some delays and caused some improvements (the exception was visible after a while) but did not resolve the issue.

I already discussed the issue with @Ellerbach (the original author) and made multiple tests with him to verify what was going on.