[SHT4x] Read serial number of sensor module

[gjnijenhuis]

The current module has no implementation for reading the serial number of the SHT4x device.
This PR implements the reading of the serial number of the SHT4x device.

Microsoft Reviewers: Open in CodeFlow

[gjnijenhuis]

@dotnet-policy-service agree

[pgrawehr]

/azp run dotnet.iot

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Ellerbach]

why not using version instead of an int?
You definitely get 2 elements:

[gjnijenhuis]

In to the example C code provided by Sensirion the serial number is also output as a 32 bit integer. When the manufacturer of the chip interprets the serial number in this way I think it would be best to be consistent and also use a 32 bit integer here.

https://github.com/Sensirion/embedded-sht/blob/master/sht4x/sht4x.c#L103

[Ellerbach]

ok but on this example code, nothing is done with this int. So the question is: how to properly use this version? Are there some specific int versions which can be tested?

[gjnijenhuis]

Agreed, in this code the serial is just stored in a 32 bit integer, at the pointer which was passed through at function call. There is no example code that uses it.

The Adafruit library has it also implemented in a similar way and has an example on how the serial is used:

Code:
https://github.com/adafruit/Adafruit_SHT4X/blob/master/Adafruit_SHT4x.cpp#L83

Example:
https://github.com/adafruit/Adafruit_SHT4X/blob/master/examples/SHT4test/SHT4test.ino#L26

Serial.println("Found SHT4x sensor");
Serial.print("Serial number 0x");
Serial.println(sht4.readSerial(), HEX);

[Ellerbach]

ok, still, there is no check. So I4m fine with this int.