J1939CAT(1)

✨ J1939CAT — like, the manual page for j1939cat ✨

okay bestie, welcome to the j1939cat glow-up 💖 this is a User Commands page, and it's fr fr about one thing: being a netcat-like tool for j1939. if you know, you know 🚗✨

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🌸 NAME 🌸

j1939cat — the manual page for j1939cat 2023.03-1build1, no crumbs left behind 👑

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🎀 SYNOPSIS 🎀

j1939cat [options] FROM TO

that's the whole vibe check. you hand it a FROM, you hand it a TO, and it does its little thing 💅

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🦋 DESCRIPTION 🦋

j1939cat: netcat-like tool for j1939. yes, that's literally the whole pitch and honestly? iconic. it's giving "netcat but make it CAN bus" 🚌💖

FROM / TO

the two address-ish arguments can be written as either:

• - (a lil dash, standing in for something else)
• [IFACE][:[SA][,[PGN][,NAME]]]

so like, interface, optional source address, optional parameter group number, optional name — all bundled up in that bracket situation 🎀

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💅 OPTIONS 💅

• -i <infile> — feeds in from infile instead. default is stdin, so if you say nothing it just vibes with stdin 🫶
• -s <size> — sets the maximal transfer size. default: 117440505 byte. not a typo, she's a big girl, go off 🔥
• -r — receive data. turn this on when you want to be the listener of the friendship, not the yapper 📥✨
• -P <timeout> — poll timeout in milliseconds, measured before sending data. heads up: with this option, send() will be used with the MSG_DONTWAIT flag. so it's non-blocking energy, no waiting around 🙈
• -R <count> — sets the send repeat count. default: 1 — like, do it once, or do it again and again and again 🔁
• -B — allows sending and receiving broadcast packets. letting everybody in the group chat read it, basically 📢

Example:

j1939cat -i some_file_to_send  can0:0x80 :0x90,0x12300 j1939cat can0:0x90 -r > /tmp/some_file_to_receive

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aaaaand that's the whole page bestie 🌈 no cap, every flag accounted for, not a single one left on read 💀

j1939cat 2023.03-1build1 🎀 December 2025 🎀 J1939CAT(1)

mwah, go forth and cat some j1939 ✨💖 bye babes 🫶