modbus_connect() timeout

[harl...@googlemail.com]

Hello,

I needed the ability to set a defined timeout period for modbus_connect() on a TCP connection. This is for periodically trying to (re-)connect to a device which may be switched off or unplugged. The default linux kernel socket connect() timeout period of about 20s is much too long for me.

The appended patch adds a new method modbus_connect_with_timeout(modbus_t *ctx, unsigned long timeout_ms) for this issue. The "old" method modbus_connect(modbus_t *ctx) internally sets the timeout to 20000ms. It's only for Linux and only for TCP connections at the moment, but it's a starting point for a further release implementation.

Cheers,

Felix

[Stéphane Raimbault]

Hi,

The 3.0 branch is in feature freeze and in 3.1 branch, the timeout of connect() is already defined by the response timeout.

http://libmodbus.org/docs/v3.1.2/modbus_set_response_timeout.html

https://github.com/stephane/libmodbus/blob/master/src/modbus-tcp.c#L337

Stéphane

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