include transport static library to libprov_device_client.so

[syedelec]

• OS and version used:
  Ubuntu

• SDK version used:
  master

Description of the issue:

When compiling a DPS application linking with -lprov_device_client, I still need to link against static library corresponding to the correct protocol I am using (e.g: AMQP_WS -lprov_amqp_ws_transport)

I thought that linking was done the same way as iothub_client library, all static library are included in the dynamic library. Instead we should use the use_amqp or use_http options in cmake to select the needed transport

The error is :
undefined reference to "Prov_Device_AMQP_WS_Protocol"

Code sample exhibiting the issue:

N/A

Console log of the issue:

undefined reference to 'Prov_Device_AMQP_WS_Protocol'
collect2: error: ld returned 1 exit status

[jebrando]

Currently for DPS we try to minimize dependencies that are automatically included and require the user to add the libraries. I don't believe that add the protocol library is not an unreasonable request, but I shall talk to the project managers to see if this should remain this way.

[jebrando]

I has been decided that requiring the library is a step that must be done. Thank you for the issue.