MODBUS_GET_RESPONSE_(3)

💖 MODBUS_GET_RESPONSE_TIMEOUT 💖

okay bestie, welcome to the libmodbus manual, section 3 (that's the library-functions section, iykyk) ✨ we're doing modbus_get_response_timeout today and honestly? she's a vibe. she's the chill one. she just tells you things. no drama, no side effects, just reading a number back to you like a good little function 🫶

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🌸 NAME 🌸

modbus_get_response_timeout — get timeout for response 👀

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✨ SYNOPSIS ✨

int modbus_get_response_timeout(modbus_t *ctx, uint32_t *to_sec,
uint32_t *to_usec);

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🎀 DESCRIPTION 🎀

so the way that modbus_get_response_timeout() works is: it returns the timeout interval that's being used to wait for a response, and it hands that value back to you through the to_sec and to_usec arguments 💅

that's it. that's the whole function. it reads, it doesn't write, it's giving very "low maintenance queen" energy 👑

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💜 RETURN VALUE 💜

• it returns 0 if everything went fine, slay ✅
• otherwise it returns -1 and sets errno, which is your little ✨signal✨ that something went sideways 😭

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🌈 EXAMPLE 🌈

uint32_t old_response_to_sec;
uint32_t old_response_to_usec;

/* Save original timeout */
modbus_get_response_timeout(ctx, &old_response_to_sec, &old_response_to_usec);

/* Define a new and too short timeout! */
modbus_set_response_timeout(ctx, 0, 0);

see how she saves the og timeout first before doing something chaotic? that's called ✨being responsible✨ bestie, take notes 🍓

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🦋 SEE ALSO 🦋

• modbus_set_response_timeout(3)
• modbus_get_byte_timeout(3)
• modbus_set_byte_timeout(3)

go read those too, they're the rest of the timeout girlies and they're all connected, fr fr 🧚

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👑 AUTHORS 👑

the libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com> — thank you for the lore, king 🙏💖

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libmodbus v3.1.6 · 11/17/2025 — that's the version and the date, and this manual page was MODBUS_GET_RESPONSE_(3), and that's the whole thing 💅✨ bye bestie, go read your timeouts 🎀