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succd: MODBUS library does not differentiate between TCP socket time outs and RTU time outs
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This commit is contained in:
hmelder 2024-11-10 07:06:56 +01:00
parent 9ec580c26f
commit 3b9c1ba912
1 changed files with 11 additions and 14 deletions
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25
succbone/succd/modbus.go
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@ -2,7 +2,6 @@ package main
import (
"context"
"net"
"time"
"github.com/simonvetter/modbus"
@ -22,7 +21,7 @@ func (d *daemon) modbusConnect() error {
// Setup modbus client
d.modbusClient, err = modbus.NewClient(&modbus.ClientConfiguration{
URL: "tcp://10.250.241.20:8887",
Timeout: 5 * time.Second,
Timeout: 1 * time.Second,
})
if err != nil {
return err
@ -48,6 +47,7 @@ func (d *daemon) modbusRestart() error {
// Returns whether modbus should restart (only in case of an underlying network error)
func (d *daemon) modbusUpdate() bool {
var err error
var numDevicesNotResponding int
// Switch to slave 1 (BTA1)
d.modbusClient.SetUnitId(1)
@ -56,9 +56,7 @@ func (d *daemon) modbusUpdate() bool {
var registersBTA1 []uint16 // temperature, humidity
registersBTA1, err = d.modbusClient.ReadRegisters(1, 2, modbus.INPUT_REGISTER)
if err != nil {
if _, ok := err.(net.Error); ok {
return true
}
numDevicesNotResponding += 1
klog.Warningf("error while reading registers from BTA1 %v", err)
} else if len(registersBTA1) != 2 {
klog.Warningf("expected two registers from modbus slave 1, but got %d", len(registersBTA1))
@ -79,9 +77,7 @@ func (d *daemon) modbusUpdate() bool {
var registersKEC2 []uint16 // temperatures dp
registersKEC2, err = d.modbusClient.ReadRegisters(0, 3, modbus.HOLDING_REGISTER)
if err != nil {
if _, ok := err.(net.Error); ok {
return true
}
numDevicesNotResponding += 1
klog.Warningf("error while reading registers from KEC2 %v", err)
} else if len(registersKEC2) != 3 {
klog.Warningf("expected three registers from modbus slave 2, but got %d", len(registersKEC2))
@ -102,9 +98,7 @@ func (d *daemon) modbusUpdate() bool {
digitalInputRegisters, err = d.modbusClient.ReadRegisters(0x81, 8, modbus.HOLDING_REGISTER)
if err != nil {
if _, ok := err.(net.Error); ok {
return true
}
numDevicesNotResponding += 1
klog.Warningf("error while reading digital inputs from KEC1 %v", err)
} else {
// Convert MODBUS words into bools
@ -157,12 +151,15 @@ func (d *daemon) modbusUpdate() bool {
err = d.modbusClient.WriteRegisters(0x01, registerValuesKEC1[:])
if err != nil {
if _, ok := err.(net.Error); ok {
return true
}
numDevicesNotResponding += 1
klog.Warningf("error while updating registers %v", err)
}
if numDevicesNotResponding >= 4 {
klog.Warningf("no device did respond to our request. Probably a network timeout.")
return true
}
return false
}