libmodbus

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How to build it for ARM

1

I need this library to build for ARM architecture, please help with steps

georgethomas08

## libmodbus version Git https://github.com/stephane/libmodbus/commit/b25629bfb508bdce7d519884c0fa9810b7d98d44 (Head as of 2023-08-10) ## OS and/or distribution Linux Debian 11 ## Environment x86 32bit gcc (Debian 10.2.1-6) 10.2.1 20210110 ## Description when using server...

martinwag

## libmodbus version Git b25629bfb508bdce7d519884c0fa9810b7d98d44 (Head as of 2023-08-10) ## Description commit db1cbc593501590eef16bbf9e0746290ac9116b9 introduced some changes with commit description "windows only". However, this commit also changed linux behavior in three...

martinwag

TCP backend should handle out of order responses

2

A libmodbus client can become stuck reading what it thinks are invalid responses (wrong transaction ID), while only one (the first) response is delayed beyond the timeout. client: modbus_read_registers (tid...

pdegoeje

In the code, O_NDELAY has been deprecated and can be replaced by O_NONBLOCK.

Freed-Wu

Broadcasting when RTU master...

3

When one is targeting slaves with MODBUS_BROADCAST_ADDRESS and say you issue modbus_write_registers, the code after sending a frame still goes through if (rc > 0) { uint8_t rsp[MAX_MESSAGE_LENGTH]; rc =...

dnssoftware

RTU over RS485 timing issues, need to poll UART LSR for TEMT flag

4

To work well with some dumb hardware, it is necessary to poll the "Tx empty" flag of the UART. Unfortunately, the typical 16550 UART doesn't support interrupts on this event,...

marekm72

Read single register of more than 2 bytes

1

Hi, I am trying to read a modbus device but it doesn't follow modbus standard. Request: `01 03 07 EE 00 02 A5 4A` Part of Data Package | Description...

sourabhburse

use poll() instead of select() when possible

4

Currently libmodbus uses select() on Linux. If socket handle is greater than FD_SETSIZE select call causes application crash due to buffer overflow. Proposed pull request uses poll() instead of select()...

2128506

modbus_write_registers return -1, reason connection timeout

3

use version 3.1.6 on linux, The client executes the modbus_write_registers function once a second, why once in a while modbus_write_registers(ctx[index], addr, count, buf) return -1, and modbus_strerror(errno) show connection timed...

yanzhang920817