Use a string user ID

// Create an IAgoraService object
auto service = createAgoraService();
// Initialize the IAgoraService object
agora::base::AgoraServiceConfiguration config;
// Set Agora App ID
config.appId = appid;
// Enable the audio processing module
config.enableAudioProcessor = enableAudioProcessor;
// Disable the audio device module
// Normally, audio capture or playback devices are not connected to a server
config.enableAudioDevice = enableAudioDevice;
// Whether to enable video
config.enableVideo = enableVideo;
// Enable user IDs in string format (the characters can be digits, letters, or special symbols)
config.useStringUid = enableUseStringUid;
if (service->initialize(config) != agora::ERR_OK) {
    return nullptr;
}

if (connection->connect(options.appId.c_str(), options.channelId.c_str(),
                        options.userId.c_str())) {
    AG_LOG(ERROR, "Failed to connect to Agora channel!");
    return -1;
}

// Create an AgoraService object
AgoraService service = new AgoraService();
if (null == service) {
    System.out.printf("createAndInitAgoraService fail\n");
    return;
}
AgoraServiceConfig config = new AgoraServiceConfig();
// Disable the audio device module (Normally we do not directly connect audio capture or playback devices to a server)
config.setEnableAudioDevice(0);
// Enable the audio processing module
config.setEnableAudioProcessor(1);
// Enable video
config.setEnableVideo(1);
// Enable user ID in String format
config.setUseStringUid(1);
int ret = service.initialize(config);
if (ret != 0) {
    System.out.printf("createAndInitAgoraService AgoraService.initialize fail ret=%d\n", ret);
    return;
}
service.setLogFile("agorasdk.log",10*1024);

RtcConnConfig ccfg = new RtcConnConfig();
ccfg.setAutoSubscribeAudio(0);
ccfg.setAutoSubscribeVideo(0);
ccfg.setChannelProfile(Constants.CHANNEL_PROFILE_LIVE_BROADCASTING);
ccfg.setClientRoleType(Constants.CLIENT_ROLE_BROADCASTER);
AgoraRtcConn conn = service.agoraRtcConnCreate(ccfg);
if (conn == null) {
    System.out.printf("AgoraService.agoraRtcConnCreate fail\n");
    return;
}
conn.connect(token, "demo_channel", "1");