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Added definition of GPSACP message element

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# GPSACP message
GPSACP messages are defined in [WTP - SCG Reference Points](https://www.hochbahn.de/hochbahn/wcm/connect/de/1d8945fd-174c-447a-85a5-4a8424406b5a/Lieferung%2Bvon%2BWLAN%2BRoutern%2BAB%2B17.12.2016.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE.Z18_JH8I1JC0L05M10AEB6TSP430A1-1d8945fd-174c-447a-85a5-4a8424406b5a-lLovXv0) can be sent within WTP Event Requests.
## Definition GPS Last Acquired Position
The GPS Last Acquired Position contains the output of the AT$GPSACP command from an WWAN Modem.
### Format
```
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WWAN Id | GPSATC ....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
```
**Vendor Id** 18681 (Travelping GmbH)
**Type** 15
**Length** >= 5
**Timestamp** The WTP’s time when the meassurment was recorded
**WWAN Id** WWAN Interface Id, used to differentiate between multiple WWAN interfaces, MUST be between
one (1) and 16.
**GPSATC** The full output (including the starting $GPSATC) of the AT$GPSATC command the WWAN Interface:
```
$GPSACP:<UTC>,<latitude>,<longitude>,<hdop>,<altitude>,<fix>,<cog>,<spkm>,<spkn>,<date>,<nsat>
<UTC>: HHMMSS
HH: Stunde (00..23)
MM: Minute (00..59)
SS: Sekunde (00..60) (Ja - 60 - Schaltsekunden...)
<latitude>: ddmm.mmmmD
dd: Grad (00..90)
mm.mmmm: Minuten mit dezimalen Nachkommerstellen (00.0000 .. 59.9999)
D: Richtung ab Äquator (N|S)
<longitude>: dddmm.mmmmD
dd: Grad (00..180)
mm.mmmm: Minuten mit dezimalen Nachkommerstellen (00.0000 .. 59.9999)
D: Richtung ab Geenwich (W|E)
<hdop>: xx.x
xx.x: Horizontale genauigkeit in m (00.0..99.9)
<altitude>: xxxx.x
xxxx.x: Höhe üNN in m (0000.0..9999.9) (Himalaya: Ceck, Holland: Im zweifel leer, wenn unter NN)
<fix>: x
x: Fix-Status (0: Kein Fix, 1: 2D, 2: 3D)
<cog>: xxx.x
xxx.x: Course over ground (000.0 .. 359.9)
<spkm>: xxx.x
xxx.x: Geschwindigkeit in km/h (000.0 .. 999.9)
<spkn>: xxx.x
xxx.x: Geschwindigkein in Knoten (000.0 .. 999.9)
<date>: ddmmyy
dd: Tag (01 .. 31)
mm: Monat (01 .. 12)
yy: Jahr (00 .. 99)
<nsat>: xx
xx: Anzahl der sichtbaren Satelliten (00 .. 99)
```