fun add(resource: UnprovisionedDeviceResource): Either<String, ProvisionedDeviceResource> {
        val id = resource.resourceId

        val readError = resourceIdValidator.validateIsReadType(id.resourceType).flatMap {
            bowlerRPCProtocol.addRead(id)
        }.mapLeft { "Not a Read" }

        val writeError = resourceIdValidator.validateIsWriteType(id.resourceType).flatMap {
            bowlerRPCProtocol.addWrite(id)
        }.mapLeft { "Not a Write" }

        return tupled(fromEither(readError), fromEither(writeError))
	      .fold({ errorList -> ... }, { (r, w) -> ... })
    }