http://{{controller-ip}}:8181/restconf/operations/netconf-node-topology:create-device

{
    "input": {
        "login-password": {
            "password": "password",
            "username": "username"
        },
        "netconf-node-optional:ignore-missing-schema-sources": {
            "reconnect-time": 5000,
            "allowed": true
        },
        "netconf-node-topology:node-id": "{{node}}",
        "actor-response-wait-time": 900,
        "concurrent-rpc-limit": 0,
        "host": "{{testtool-ip}}",
        "sleep-factor": 1,
        "port": 17830,
        "tcp-only": false,
        "connection-timeout-millis": 20000,
        "max-connection-attempts": 0,
        "keepalive-delay": 300,
        "schema-cache-directory": "MX2020-19.3R2.9",
        "between-attempts-timeout-millis": 2000,
        "schemaless": false,
        "default-request-timeout-millis": 600000
    }
}

{
    "errors": {
        "error": [
            {
                "error-type": "protocol",
                "error-tag": "malformed-message",
                "error-message": "Error parsing input: Schema node with name ignore-missing-schema-sources was not found under (urn:opendaylight:netconf-node-topology?revision=2015-01-14)input.",
                "error-info": "Schema node with name ignore-missing-schema-sources was not found under (urn:opendaylight:netconf-node-topology?revision=2015-01-14)input."
            }
        ]
    }
}