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Add additional Pylontech CAN protocol fields
I noticed that these are missing while looking at dissassembly of the Pytes implementation of the protocol. I also found Pylontech sample CAN messages] which match the Pytes implementation [1]: ``` CAN ID – followed by 2 to 8 bytes of data: 0x351 – 14 02 74 0E 74 0E CC 01 – Battery voltage + current limits ^^^^^ discharge cutoff voltage 46.0V 0x355 – 1A 00 64 00 – State of Health (SOH) / State of Charge (SOC) 0x356 – 4e 13 02 03 04 05 – Voltage / Current / Temp 0x359 – 00 00 00 00 0A 50 4E – Protection & Alarm flags ^^^^^ always 0x50 0x59 in Pytes implementation ^^ module count (matches the blog article image) 0x35C – C0 00 – Battery charge request flags ^^ two possible additional flags (bit 3 and bit 4) 0x35E – 50 59 4C 4F 4E 20 20 20 – Manufacturer name (“PYLON “) ^^^^^^^^^^^^^^ Note: Pytes sends a 5-byte message "PYTES" instead padding with spaces ``` The extra charge request flag is "bit4: SOC low" (Seems to be SoC < 10% threshold for Pytes), I haven't bothered adding that as it provides little value. [1] https://www.setfirelabs.com/green-energy/pylontech-can-reading-can-replication
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