Create /etc/venus/relays and add the relevant gpio ports etc/ venus/relays (file contents)
Not will only create 1 gpio port, it won't do 4?


echo /sys/class/gpio/gpio21 > /etc/venus/relays
echo /sys/class/gpio/gpio17 > /etc/venus/relays
echo /sys/class/gpio/gpio27 > /etc/venus/relays
echo /sys/class/gpio/gpio22 > /etc/venus/relays

/sys/class/gpio/gpio21
/sys/class/gpio/gpio17 (not entered)
/sys/class/gpio/gpio27 (not entered)
/sys/class/gpio/gpio22 (not entered)

etc/venus/gpio_list (file contents)

# This is a list of gpio pins, set by the script /etc/rcS.d/S90gpio_pins.sh
# They are documented at: https://github.com/victronenergy/venus/wiki/bbb-gpio
# Format: <pin_number> <direction: in/out> <name>
#
# The <name> part is used to create an symlink in /dev/gpio.

# Relay 1 Pin 40 / GPIO 21
# Relay 2 Pin 11 / GPIO 17
# Relay 3 Pin 13 / GPIO 27 Not function at the moment if activated relay setting disappers?
# Relay 4 Pin 15 / GPIO 22 Not function at the moment if activated relay setting disappers?

21 out relay_1
17 out relay_2
//27 out relay_3
//22 out relay_4

# Digital input 1 Pin 29 / GPIO 05
5 in digital_input_1
# Digital input 2 Pin 31 / GPIO 06
6 in digital_input_2
# Digital input 3 Pin 33 / GPIO 13
13 in digital_input_3
# Digital input 4 Pin 35 / GPIO 19
19 in digital_input_4
# Digital input 5 Pin 37 / GPIO 26
26 in digital_input_5

optvictronenrgy/gui/qml/Page SettingRelay.qml (file contents)

import QtQuick 1.1
import com.victron.velib 1.0
import "utils.js" as Utils

MbPage {
id: pageRelaySettings
title: qsTr("Relay")
property string bindPrefix: "com.victronenergy.settings"
property VBusItem relay1Item: VBusItem { bind: "com.victronenergy.system/Relay/1/State" }
property bool hasRelay1: relay1Item.valid
property VBusItem relay2Item: VBusItem { bind: "com.victronenergy.system/Relay/2/State" }
property bool hasRelay2: relay1Item.valid
property VBusItem relay3Item: VBusItem { bind: "com.victronenergy.system/Relay/3/State" }
property bool hasRelay3: relay1Item.valid

model: VisualItemModel {
MbItemOptions {
id: relayFunction
description: hasRelay1 ? qsTr("Function (Relay 1)") : qsTr("Function")
bind: Utils.path(bindPrefix, "/Settings/Relay/Function")
possibleValues:[
MbOption { description: qsTr("Alarm relay"); value: 0 },
MbOption { description: qsTr("Generator start/stop"); value: 1 },
MbOption { description: qsTr("Tank pump"); value: 3 },
MbOption { description: qsTr("Manual"); value: 2 }
]

}


MbItemOptions {
description: qsTr("Alarm relay polarity")
bind: Utils.path(bindPrefix, "/Settings/Relay/Polarity")
show: relayFunction.value === 0
possibleValues: [
MbOption { description: qsTr("Normally open"); value: 0 },
MbOption { description: qsTr("Normally closed"); value: 1 }
]
}

MbSwitch {
id: relaySwitch
// Use a one-way binding, because the usual binding:
// checked: Relay.relayOn
// will be broken when the switched toggled, and changes in the relayOn property made
// elsewhere will not change the state of the switch any more.
Binding {
target: relaySwitch
property: "checked"
value: Relay.relayOn
when: true
}
enabled: userHasWriteAccess
name: qsTr("Alarm relay On")
onCheckedChanged: Relay.relayOn = checked;
show: relayFunction.value === 0
}

MbSwitch {
id: manualSwitch
name: hasRelay1 ? qsTr("Relay 1 On") : qsTr("Relay On")
bind: "com.victronenergy.system/Relay/0/State"
show: relayFunction.value === 2 // manual mode
}

MbSwitch {
id: manualSwitch1
name: qsTr("Relay 2 On")
bind: "com.victronenergy.system/Relay/1/State"
show: hasRelay1
}

MbSwitch {
id: manualSwitch2
name: qsTr("Relay 3 On")
bind: "com.victronenergy.system/Relay/2/State"
show: hasRelay2
}

MbSwitch {
id: manualSwitch3
name: qsTr("Relay 4 On")
bind: "com.victronenergy.system/Relay/3/State"
show: hasRelay3

}
}

}