espressif/esp-modbus

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ESP-Modbus - the officially suppported library for Modbus protocol (serial RS485 + TCP over WiFi or Ethernet).

Stars: 196
Forks: 91
Open beginner issues: 0
Indexed issues: 14

Dominant language: C
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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14 open issues indexed

Serial master uses uninitialized descriptor size when no descriptor table is configured (EPROT-86) Open

Status: Opened

Difficulty 3/5 1-2 days Newbie friendliness 68/100

espressif/esp-modbus#187 · Opened Sep 17, 2026
Heap corruption after near-simultaneous TCP response timeout on 2+ slave nodes (multi-instance TCP master) (EPROT-85) Open

Status: Opened

espressif/esp-modbus#185 · 5 comments · 1 assignee · Opened Sep 2, 2026
Transaction handling leaving transactions in half-processed state when multiple Modbus TCP transactions are received in close proximity to each other. (EPROT-83) Open

Status: Opened

espressif/esp-modbus#184 · 1 comment · 1 reaction · 1 assignee · Opened Aug 27, 2026
[v1.0.18] Serial-master OOM paths can delete invalid task handles (EPROT-75) Open

Status: Opened

espressif/esp-modbus#181 · 1 comment · 1 assignee · Opened Jul 25, 2026
New communication method user-defined extension interface (EPROT-71) Open

Status: Opened

espressif/esp-modbus#176 · 1 comment · 1 assignee · Opened Jun 10, 2026
Use after free when Modbus TCP slave responds after response timeout (EPROT-57) Open

Status: Selected for Development

espressif/esp-modbus#164 · 1 comment · 1 assignee · Opened Mar 25, 2026
[DOC] documentation latest contains old v1 api (as opposed to stable that has v2 already) (EPROT-38) Open

Status: Opened

espressif/esp-modbus#157 · 4 comments · 1 assignee · Opened Jan 21, 2026
Initializing a Modbus Master uses CONFIG_FMB_TCP_PORT_DEFAULT instead of mb_communication_info_t config.tcp_opts.port (EPROT-21) Open

espressif/esp-modbus#150 · 2 comments · 1 assignee · Opened Nov 13, 2025
RTU Master cannot keep up with (very) responsive slave or bus spikes/faulty bytes (EPROT-16) Open

Status: Selected for Development

espressif/esp-modbus#145 · 12 comments · 1 assignee · Opened Oct 30, 2025
mbc_master_start(modbus) fails with error 258 ESP_ERR_INVALID_ARG (IDFGH-15441) Open

Status: Opened

espressif/esp-modbus#123 · 3 comments · 1 assignee · Opened Jun 8, 2025
Confusing architecture and examples (IDFGH-15438) Open

Status: Opened

Difficulty 5/5 Over a week Newbie friendliness 35/100

espressif/esp-modbus#122 · 1 comment · Opened Jun 7, 2025
Both V1 and V2 are extremely difficult to use. (IDFGH-15257) Open

Status: Reviewing

espressif/esp-modbus#118 · 4 comments · 1 assignee · Opened May 7, 2025
Modbus Slave TCP randomly fails to start (lost MB_EVENT_READY ? ) (v2) (IDFGH-15130) Open

Status: Opened

espressif/esp-modbus#112 · 1 assignee · Opened Apr 17, 2025
mbc_master_send_request() doesn't work properly (IDFGH-10848) Open

Status: Opened

espressif/esp-modbus#32 · 9 comments · 1 assignee · Opened Aug 10, 2023

espressif/esp-modbus

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