I'd like to run unit-test-server tcp on one R-pi and unit-test-client tcp on another but the unit-tests are only set up for loopback tests.

[Bob Kruse]

Hello,

I'm evaluating hardware for a system where a master pi3 would communicate with a slave dsp board over Ethernet, likely as not with Modbus tcp.

I followed the steps at https://github.com/stephane/libmodbus/wiki/Libmodbus-on-Raspberry-pi, it built and the unit tests ran nicely between two windows on the same pi.

I added avahi-daemon and avahi-auto-ipd and connected the PIs together.

ifconfig told me the addresses, and I can ping between them.

I edited unit-test-server.c on one pi and unit-test-client.c on the other.

I changed the line "ctx = Modbus_new_tcp("127.0.0.1",1502);" in each PI to use the correct IP address for the other PI.

sudo make install in both ~/libmodbus folders.

When I run ./unit-test-server  tcp in the one PI the response is

"Waiting for a indication"

But when I ran ./unit-test-client tcp on the other I get

"Connecting to 169.254.162.182:1502 

Connection failed: Connection refused"

I thought maybe johnneren's patch (https://github.com/johnneren/libmodbus) would help, but I got the same result.

Can anyone suggest how I can run the unit tests between a libmodbus server on one PI and a libmodbus client on another PI?

 

Thank you,

Bob

[Bob Kruse]

I received the suggestion that I change the :

-server.c line "ctx = Modbus_new_tcp("127.0.0.1",1502);" to line "ctx = Modbus_new_tcp("0.0.0.0",1502);"

-client.c line to "ctx = Modbus_new_tcp("addr",1502);" where addr is the address reported by the servers ifconfig.

This worked and ran unit-test-client on one pi and unit-test-server on the other.

[Stéphane Raimbault]

Good suggestion and it wasn't properly documented:

https://github.com/stephane/libmodbus/commit/a002b3897d3039c57956346262139bd3662e21c8

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