I think Maksim is trying to setup his node-red with the modbus server node to push modbus data to his MasterScada4D software.
@MaksimKr i tried the 0.0.0.0 on my system and it seems to be working.
Can you try this flow that has a basic server and also has a Modbus read node in the same flow to see at least from the flow itself if you can read some values ?
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\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":215,"y":320,"wires":[["1caf5383.ecd054"]],"l":false},{"id":"2676e2cd.f34d36","type":"inject","z":"937cb040.d8e16","name":"","props":[{"p":"payload","v":"true","vt":"bool"},{"p":"topic","v":"","vt":"string"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":75,"y":320,"wires":[["b4397fad.8ffaa"]],"l":false},{"id":"cbee0647.5cb71","type":"function","z":"937cb040.d8e16","name":"","func":"msg.payload = {\n 'value': [1, 1, 1, 1, 1, 1, 1, 0],\n 'register': 'coils', \n 'address': 0 , \n 'disableMsgOutput' : 1 \n}; \nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":215,"y":360,"wires":[["1caf5383.ecd054"]],"l":false},{"id":"1f92d036.c8f418","type":"inject","z":"937cb040.d8e16","d":true,"name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":155,"y":360,"wires":[["cbee0647.5cb71"]],"l":false},{"id":"6561bf00.a24e9","type":"function","z":"937cb040.d8e16","name":"","func":"msg.payload = {\n 'value': [true,true,true], \n 'register': 'discrete', \n 'address': 0 , \n 'disableMsgOutput' : 0 \n}; \nreturn msg;\n\n","outputs":1,"noerr":0,"x":215,"y":400,"wires":[["1caf5383.ecd054"]],"l":false},{"id":"6309b3fc.cd9294","type":"inject","z":"937cb040.d8e16","d":true,"name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":155,"y":400,"wires":[["6561bf00.a24e9"]],"l":false},{"id":"1caf5383.ecd054","type":"link out","z":"937cb040.d8e16","name":"","links":["7328d10f.1b78"],"x":295,"y":340,"wires":[]},{"id":"7328d10f.1b78","type":"link in","z":"937cb040.d8e16","name":"","links":["1caf5383.ecd054"],"x":75,"y":80,"wires":[["ef501f41b4d30c54"]]},{"id":"f9e611ca.64c348","type":"catch","z":"937cb040.d8e16","name":"","scope":null,"uncaught":false,"x":535,"y":280,"wires":[["f8090829.87c3c"]],"l":false},{"id":"f8090829.87c3c","type":"debug","z":"937cb040.d8e16","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":615,"y":280,"wires":[],"l":false},{"id":"257b008693b81069","type":"modbus-read","z":"937cb040.d8e16","name":"","topic":"","showStatusActivities":false,"logIOActivities":false,"showErrors":false,"unitid":"1","dataType":"HoldingRegister","adr":"0","quantity":"8","rate":"5","rateUnit":"s","delayOnStart":false,"startDelayTime":"","server":"d9a243e58f12f2f1","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"x":530,"y":420,"wires":[[],["8d4f8f1d68c6fb1e"]]},{"id":"8d4f8f1d68c6fb1e","type":"debug","z":"937cb040.d8e16","name":"buffer","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload.buffer","targetType":"msg","statusVal":"","statusType":"auto","x":680,"y":420,"wires":[]},{"id":"ef501f41b4d30c54","type":"modbus-server","z":"937cb040.d8e16","name":"","logEnabled":true,"hostname":"0.0.0.0","serverPort":"10512","responseDelay":100,"delayUnit":"ms","coilsBufferSize":"8","holdingBufferSize":"8","inputBufferSize":"8","discreteBufferSize":"8","showErrors":true,"x":240,"y":80,"wires":[["18336ed.bd8a491"],["18336ed.bd8a491"],["18336ed.bd8a491"],["18336ed.bd8a491"],["18336ed.bd8a491"]]},{"id":"d9a243e58f12f2f1","type":"modbus-client","name":"","clienttype":"tcp","bufferCommands":true,"stateLogEnabled":false,"queueLogEnabled":false,"tcpHost":"127.0.0.1","tcpPort":"10512","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB","serialType":"RTU-BUFFERD","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":"1","commandDelay":"1","clientTimeout":"1000","reconnectOnTimeout":true,"reconnectTimeout":"2000","parallelUnitIdsAllowed":true}]
Inject some Holding register values and check if you see them.
Other things you can check whether any firewall is blocking that port.
