Info Frame; Keep-Alive Frame - Libelium Waspmote Plug & Sense! Smart Parking Technical Manual

7.1. Info frame

It is the most common frame sent by the node. The node will send this kind of frame each time it detects that the parking slot
changed from empty to occupied or vice-versa. The other bytes are used to give additional data to the user.
Byte Name
0 Basic data
1 Frame counter
2 Temperature MSB
3 Temperature LSB
4 X axis measurement MSB
5 X axis measurement LSB
6 Y axis measurement MSB
7 Y axis measurement LSB
8 Z axis measurement MSB
9 Z axis measurement LSB
10-11 Reserved
Figure : Info frame structure

7.2. Keep-Alive frame

This frame is used to indicate that the parking slot has not changed, but the node is still working.
Byte
0
1
2
3
4 Temperature MSB
5
6 X axis measurement MSB
7 X axis measurement LSB
8 Y axis measurement MSB
9 Y axis measurement LSB
10 Z axis measurement MSB
11 Z axis measurement LSB
Figure : Keep-Alive frame structure
Name
Basic data
Frame counter
Timestamp (hh)
Timestamp (mm)
Temperature LSB
Description
Detailed description in the section "Frame"
Detailed description in the section "Frame"
Raw temperature from the node's internal sensor. The value stored
in these two bytes is a 16-bit value in 2's complement form. To
convert to Celsius degrees use the next formula:
Raw value from the sensor associated to the X axis. The value stored
in these two bytes is a 16-bit value in 2's complement form.
Raw value from the sensor associated to the Y axis. The value stored
in these two bytes is a 16-bit value in 2's complement form.
Raw value from the sensor associated to the Z axis. The value stored
in these two bytes is a 16-bit value in 2's complement form.
Reserved bytes. Do not consider.
Detailed description in section "Frame"
Detailed description in section "Frame"
Current hours
Current minutes
Raw temperature from the node's internal sensor. The value stored in
these two bytes is a 16-bit value in 2's complement form. To convert to
Celsius degrees use the next formula:
Raw value from the sensor associated to the X axis. The value stored in
these two bytes is a 16-bit value in 2's complement form.
Raw value from the sensor associated to the Y axis. The value stored in
these two bytes is a 16-bit value in 2's complement form.
Raw value from the sensor associated to the Z axis. The value stored in
these two bytes is a 16-bit value in 2's complement form.
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Description
Frames
v7.0