OutlineTunnel start with transportConfig string returned error code 6 (ErrorCode.vpnStartFailure)

[Wayyan]

Hi, I am new to iOS Outline lib.

I am trying to connect to my vpn server through OutlineTunnel's OutlineVpn.shared.start(_ tunnelId: String, named name: String?, withTransport transportConfig: String) method. I don't know how to give tunnelId and transportConfig properly and I tried to pass some possible value into these params and everytime I got error code 6 (ErrorCode.vpnStartFailure). Here are my tried -

1. Tunnel Id as app bundle identifier and transportConfig as ss:// key,
   let code = await OutlineVpn.shared.start("org.company.VPPN",named: "VPPN",withTransport: "ss://Y2hhY2hhMjAtaWV0Zi1wb2x5MTMwNTpaZFdaOVF2RmxiT09HcmVNb0UzQnE4@159.65.129.128:18814#Outline"))

2. Tunnel Id as app bundle identifier and transportConfig as json string.
   let config = OutlineConfig(server: "159.65.129.128", server_port: 18814, local_port: 1080, password: "ZdWZ9QvFlbOOGreMoE3Bq8", method: "chacha20-ietf-poly1305", remarks: "Okay")

let code = await OutlineVpn.shared.start("org.company.VPPN",named: "VPPN",withTransport: config.toJson())