Busmaster does not work correctly. For example, when trying to send PGN=0xfeec, Type=Broadcast, From=0xfe, To=0xf3, DLC=18, Prio=7, Data=0102030405060708090a0b0c0d0e0f10112a, then Busmaster will create a TPCM with data bytes:

[wsgq007]

Busmaster does not work correctly. For example, when trying to send PGN=0xfeec, Type=Broadcast, From=0xfe, To=0xf3, DLC=18, Prio=7, Data=0102030405060708090a0b0c0d0e0f10112a, then Busmaster will create a TPCM with data bytes:

20 12 00 03 ff f3 fe 00

ie for a PGN fef3, instead of feec. Setting To=0xec will, as a workaround, give a correct TPCM, but then the TPDT will still be wrong and have an ID with DA=0xec. J1939/21 is pretty clear about what DA should be set to: "Global (DA = 255) for TP.CM.BAM data transfers"

Originally posted by @astrand in #916 (comment)