add support Segger tunnel server

[Sauci]

I'm not sure if it would be possible, but it would be great to be able to open a device over the Segger's remote server using the name/serial number and optional password parameters.

To launch the server, provide either the serial number or the name, and an optional password:

• ./JLinkRemoteServerCLExe -UseTunnel -TunnelBySN <serial_number> -TunnelPW <password>
• ./JLinkRemoteServerCLExe -UseTunnel -TunnelByName <name> -TunnelPW <password>

Once the server is running, it is possible to connect to it using JLinkExe application:

• JLinkExe ip tunnel:<serial_number>:<password>
• JLinkExe ip tunnel:<tunnel_name>:<password>

Does anyone knows if this feature is available in the latest version of the DLL? My first guess would be to call the DLL function JLINKARM_SelectIP with "tunnel:<name>:<password>", but I don't know how to handle the second port parameter.

[hkpeprah]

Someone added open_tunnel(), which takes a serial number and port; I suppose you could pass in the tunnel name in the place of the serial number, and password in place of the port, and it might work?

[Sauci]

Yes, I've added this feature (issue #36). When we call open_tunnel(), the function internally calls open() and open() calls the JLink API JLINKARM_SelectIP(address=str, port=int). Internally, both address and port parameters are extracted from the ip_addr parameter of the open function using the rsplit function (see file changes of issue #36). However, if the open() function if called with ip_addr=tunnel:<serial_number>:<password>, there is no way to retrieve the integer value of port, which is required in the call of JLINKARM_SelectIP API.