in chime-sdk-signaling-cpp/src/utils/signal_frame_debug_utils.h [15:21]
static std::string DuplexToString(signal_sdk::SdkStreamServiceType duplex) {
std::map<signal_sdk::SdkStreamServiceType, std::string> duplex_strings = {
{signal_sdk::SdkStreamServiceType::RX, "RX"},
{signal_sdk::SdkStreamServiceType::TX, "TX"},
{signal_sdk::SdkStreamServiceType::DUPLEX, "DUPLEX"}};
return duplex_strings[duplex];
}