After installing SNMP feature then making an RESTCONF request via SNMP request to a node with a running SNMP client you will recieve a error

HTTP 501 ERROR
"No implementation of RPC AbsoluteSchemaPath

{path=[(urn:opendaylight:snmp?revision=2014-09-22)snmp-get]}

available"

1. Tested
   distribution-karaf-0.4.2-Beryllium-SR2

1. Steps
   I installed the snmp feature using the then made an RESTCONF request via SNMP request to 10.10.199.118 where an SNMP daemon is running.

HTTP GET
http://10.10.199.118:8181/restconf/operations/snmp:snmp-get

PAYLOAD
{
"input":

{ "ip-address": "10.10.199.118", "oid": "1.3.6.1.2.1.1.1.0", "get-type": "GET-NEXT", "community": "209ijvfwer0df92jd" }

}

The request can be replicated using:
curl -H "Content-Type: application/json" -X POST -d '{"input": { "ip-address": "10.10.199.118","oid": "1.3.6.1.2.1.1.1.0","get-type": "GET-NEXT","community":"209ijvfwer0df92jd"}}' http://10.10.199.118:8181/restconf/operations/snmp:snmp-get

1. Expected Result
   HTTP 200 response

1. Actual Result
   HTTP STATUS 501
   Error sending request - : No implementation of RPC AbsoluteSchemaPath {path=[(urn:opendaylight:snmp?revision=2014-09-22)snmp-get]}

   available