add set/get pcan device number

[gordon-epc]

Add get_pcan_device_number and set_pcan_device_number methods, which gives the ability to get/set PCAN device number/ID like the PEAK-System PCAN-View application.

[codecov]

Codecov Report

Merging #987 (f451343) into develop (68bee14) will decrease coverage by 0.09%.
The diff coverage is 15.38%.

@@             Coverage Diff             @@
##           develop     #987      +/-   ##
===========================================
- Coverage    70.39%   70.30%   -0.10%     
===========================================
  Files           76       76              
  Lines         7381     7394      +13     
===========================================
+ Hits          5196     5198       +2     
- Misses        2185     2196      +11     

[gordon-epc]

I tested the new methods by connecting a PEAK-System PCAN-USB interface (IPEH-002021) to a Windows PC, executing the PCAN-View application, calling the set method and verifying that PCAN-View updated accordingly, and calling get and checking that it returned the expected value. I also tested the set method with a variety of good and bad parameter values and the method behaved appropriately.

[hardbyte]

Thanks for the contribution, could you please take a look at the failing tests - https://travis-ci.com/github/hardbyte/python-can/jobs/490305673

[KloolK]

Confirmed to also work with PCAN-USB FD (IPEH-004022) 👍

[gordon-epc]

It looks like the failing test also failed the same way on the current head of develop.

[hardbyte]

Ahh that's not great. Thanks for following up.

[altendky]

It is still failing, but there's an attempt to fix the issue over in #984.