Provide client access to other microservices

[iain-anderson]

🚀 Feature Request

Relevant Package [REQUIRED]

This feature request is for... C Device SDK

Description [REQUIRED]

Provide a facility for device services to easily access other edgex services. Initially this will be REST based

Describe the solution you'd like

If you have a solution in mind, please describe it.

• expose the existing endpoint structure
• provide a function to resolve an endpoint. This will work from cached configuration or the registry, as appropriate
• expose some form of the existing ping_client function for checking that a service is running
• provide a function which accepts an endpoint, an api path, a payload and a method; which performs marshalling/de-marshalling and returns the response.
• rework the existing internal clients to use the above

Describe alternatives you've considered

Have you considered any alternative solutions or workarounds?