Function parseTarget

common/transferprotocol.cpp:236–248

    }

    std::optional<HostPort> parseTarget(const std::string& ipPort)
    {
        size_t colon = ipPort.find(':');
        if (colon == std::string::npos) {
            return std::nullopt;
        }
        std::string ip = ipPort.substr(0, colon);
        int port       = atoi(ipPort.substr(colon + 1).c_str());
        if (ip.empty() || port <= 0 || port > 65535) {
            return std::nullopt;
        }
        return HostPort{std::move(ip), (uint16_t)port};
    }

    bool validPin(const std::string& pin)
    {