Add Function Blocks for SAE J1939 or ISO 11783 Message Reception

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Add Function Blocks for SAE J1939 or ISO 11783 Message Reception

List

			Symbol
1.	WBSD	Wheel-based Speed and Distance
2.	GBSD	Ground-based Speed and Distance

list be be written further.

In Detail:

WBSD

ISO 11783-7
PGN 65096

Specification is also mirrored in SAE J1939

solved with PR #189

Wheel-based Speed and Distance WBSD

Message sent by the Tractor ECU on the implement bus on construction and agricultural implements providing to connected systems the current measured wheel-based speed. The message also includes a free-running distance counter, an indication of the direction of travel and the state of the start/stop switch or input.

When the ignition key switch is turned off, both the ECU_PWR and PWR have to be maintained to send this message for an additional 2 s. This is not required when the engine is cranking (starting).

Accuracies of both wheel-based and ground-based sources can be speed-dependent and degrade at low speeds. Wheel-based information might not be updated at the 100 ms rate at low speeds.

https://www.isobus.net/isobus/pGNAndSPN/14648?type=PGN

SPN	SP Name	SP Position In PG	SP Length	Scaling	Offset	Link	Symbol
1862	Wheel-based machine speed	1-2	16 bits	0.001 m/s per bit	0	link
1863	Wheel-based machine distance	3-6	32 bits	0.001 m/bit	0	link
1866	Maximum Time of Tractor Power	7	8 bits	1 min/bit	0	link
1864	Wheel-based machine direction	8.1	2 bits	4 states/2 bit	0	link
1865	Key switch state	8.3	2 bits	4 states/2 bit	0	link
5203	Implement Start/Stop operations	8.5	2 bits	4 states/2 bit	0	link
5244	Operator direction reversed	8.7	2 bits	4 states/2 bit	0	link

GBSD

GBSD ist currently WIP

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