The SNMP library included in Dynamic C allows it to be a managed device (process received SNMP requests), not to act as a manager (send requests out and process responses).
I wrote an SNMP client library for Dynamic C 8.61 to send simple requests and process the responses, but it was specific to a particular project and wasn’t really designed for general use. Contact me at tom@tomlogic.com if you are interested in licensing it for your project.