Write logging output to a telnet port

[probonopd]

We are currently using #include <circle/logger.h> in MiniDexed.
However, some devices running MiniDexed firmware don't even expose the HDMI port.

So we would like to output the log over the network, e.g., if a client is connected via telnet.

Is this possible?

[rsta2]

Should be possible via telnet, but requires some custom programming. The recommended way to transfer log messages over a local network in Circle is the syslog protocol, which is already implemented and shown in the sample/33-syslog. See the README for details. The sample comes with a simple syslog server for Linux, but there are also apps for smartphones, with which you can receive and view the log messages.

[probonopd]

Thanks @rsta2. Will use that then. I have it working in principle, but am struggling with the hardcoded IP address of the server.

[rsta2]

Something like this should work (not tested):

// in config.h

{
...
	CIPAddress GetNetworkSyslogServerIPAddress (void);

private:
	CIPAddress m_SyslogServerIP;
...
}

// in config.cpp

void CConfig::Load (void)
{
...
	const u8 *pSyslogServerIP = m_Properties.GetIPAddress ("NetworkSyslogServerIPAddress");
	if (pSyslogServerIP)
	{
		m_SyslogServerIP.Set (pSyslogServerIP);
	}
...
}

CIPAddress CConfig::GetNetworkSyslogServerIPAddress (void)
{
	return m_SyslogServerIP;
}

// in network initialization:

{
...
	CIPAddress ServerIP = m_pConfig->GetNetworkSyslogServerIPAddress();
	if (ServerIP.IsSet () && !ServerIP.IsNull ())
	{
		static const u16 usServerPort = 8514;	// standard port is 514
		CString IPString;
		ServerIP.Format (&IPString);
		LOGNOTE ("Sending log messages to %s:%u",
			 (const char *) IPString, (unsigned) usServerPort);

		new CSysLogDaemon (m_pNet, ServerIP, usServerPort);
	}
...
}

To disable the syslog server, you only need to out-comment the line in MiniDexed.ini or set it to 0.0.0.0:

#NetworkSyslogServerIPAddress=192.168.0.143

NetworkSyslogServerIPAddress=0.0.0.0

[probonopd]

Thanks. Works.