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Re: [lwip-users] STM32 + lwip(modbus tcp), always timeout

From: Sergio R. Caprile
Subject: Re: [lwip-users] STM32 + lwip(modbus tcp), always timeout
Date: Fri, 4 Jan 2019 09:31:24 -0300
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

There is no modbusTCP on lwIP. Go to the ones who wrote that and ask
them for help.
1.3.2 is a version perhaps older than the STM32 itself, you should get a
more up to date framework for your endeavours.

Before you do that, try to know at least if TCP is connecting. ModbusTCP
is a simple protocol, a client connects to a server and sends a request;
a timeout means that either the connection or the transaction did not
succeed. You can debug either with the proper tools (wireshark)

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