Commented Unassigned: SetPlantTime returned an error // getInverterData(sbftest) returned an error // getSoftwareVersion returned an error [170]

Hello,

Is this a bug or a feature that following error messages are always written to "stdout" instead of being suppressed ("-q") or send to "stderr" so it can be treated separately, e.g. in connection with 123solar....

```
SetPlantTime returned an error: -1
getInverterData(sbftest) returned an error: -1
getSoftwareVersion returned an error: -1
```
Following scenario to show what I means:

situation 1: everything as expected
```
pi@raspberrypi2:~ $ /usr/local/bin/sbfspot.3/SBFspot -v -finq -nocsv -nosql
SBFspot V3.3.2
Yet another tool to read power production of SMA solar inverters
(c) 2012-2016, SBF (https://sbfspot.codeplex.com)
Compiled for Linux (LE) 32 bit

Commandline Args: -v -finq -nocsv -nosql
Reading config '/usr/local/bin/sbfspot.3/SBFspot.cfg'
Sun Jan 29 18:28:34 2017: INFO: Starting...
sunrise: 07:54
sunset : 17:10
Connecting to 00:80:25:0A:1A:C5 (1/15)
Initializing...
SUSyID: 125 - SessionID: 838052592 (0x31F3AAF0)
SMA netID=01
Serial Nr: 7D2D036C (2100101996)
BT Signal=69.8%
Logon OK
Failed to get current plant time (0)
getInverterData(sbftest) returned an error: -1
getSoftwareVersion returned an error: -1
SUSyID: 78 - SN: 2100101996
Device Name: SN: 2100101996
Device Class: Solar Inverters
Device Type: SB 4000TL-20
Software Version:
Serial number: 2100101996
SUSyID: 78 - SN: 2100101996
Device Status: Ok
SUSyID: 78 - SN: 2100101996
Device Temperature: 0.0°C
SUSyID: 78 - SN: 2100101996
GridRelay Status: Information not available
SUSyID: 78 - SN: 2100101996
Pac max phase 1: 4000W
Pac max phase 2: 4000W
Pac max phase 3: 4000W
SUSyID: 78 - SN: 2100101996
Energy Production:
EToday: 14.905kWh
ETotal: 30365.740kWh
Operation Time: 29339.49h
Feed-In Time : 28291.31h
SUSyID: 78 - SN: 2100101996
DC Spot Data:
String 1 Pdc: 0.000kW - Udc: 0.00V - Idc: 0.000A
String 2 Pdc: 0.000kW - Udc: 0.00V - Idc: 0.000A
SUSyID: 78 - SN: 2100101996
AC Spot Data:
Phase 1 Pac : 0.000kW - Uac: 0.00V - Iac: 0.000A
Phase 2 Pac : 0.000kW - Uac: 0.00V - Iac: 0.000A
Phase 3 Pac : 0.000kW - Uac: 0.00V - Iac: 0.000A
Total Pac : 0.000kW
SUSyID: 78 - SN: 2100101996
Grid Freq. : 0.00Hz
SUSyID: 78 - SN: 2100101996
Current Inverter Time: 29/01/2017 19:05:31
Inverter Wake-Up Time: 29/01/2017 07:56:37
Inverter Sleep Time : 29/01/2017 17:14:37
********************
* ArchiveDayData() *
********************
startTime = 588D2270 -> 29/01/2017 00:00:00
**********************
* ArchiveMonthData() *
**********************
startTime = 5868E130 -> 01/01/2017 12:00:00
Reading events: 2017-Jan-01
Sun Jan 29 18:29:38 2017: INFO: Done.
```
situation 2: output in quiet mode is OK?!?
(test is send to stdout since it cannot be redirected with a " 2>err.txt "
```
pi@raspberrypi2:~ $ /usr/local/bin/sbfspot.3/SBFspot -q -finq -nocsv -nosql
SetPlantTime returned an error: -1
getInverterData(sbftest) returned an error: -1
getSoftwareVersion returned an error: -1

```

situation 3: when being used with 123solar....
```
pi@raspberrypi2:~ $ /usr/local/bin/sbfspot.3/SBFspot -q -finq -nocsv -nosql -123s=DATA
SetPlantTime returned an error: -1
getInverterData(sbftest) returned an error: -1
getSoftwareVersion returned an error: -1
20170129-19:07:06 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 30365.740 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 >>>S123:OK
```

Question:
Is this behavior OK ?



Comments: See also https://sbfspot.codeplex.com/discussions/661017