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Write protection on the SD card was removed in current firmware releases

~/enableWriteAccess.sh

~/disableWriteAccess.sh

vim can be used to edit files.

sudo chmod o+wr /etc/lobaro-modbus-server/lobaro-modbus-server.yml

sudo vim /etc/lobaro-modbus-server/lobaro-modbus-server.yml

sudo systemctl restart lobaro-modbus-server

sudo systemctl status lobaro-modbus-server

sudo journalctl --no-pager -e -u lobaro-modbus-server

{
  "0000000000000000-1": {
    "adr": true,
    "applicationID": "1",
    "applicationName": "default",
    "data": "AAMEAOQN1g==",
    "devEUI": "0000000000000000",
    "deviceName": "0000000000000000",
    "fCnt": 1,
    "fPort": 1,
    "object": {
      "temp": 22.8,
      "vBat": 3.542,
      "version": "v0.3.4"
    },
    "rxInfo": [
      {
        "gatewayID": "0000000000000000",
        "loRaSNR": 8.8,
        "location": {
          "altitude": 0,
          "latitude": 0,
          "longitude": 0
        },
        "name": "default",
        "rssi": -36,
        "uplinkID": "ce2e086a-d747-4813-9428-b7a4a45abcc8"
      }
    ],
    "txInfo": {
      "dr": 0,
      "frequency": 868300000
    }
  }
}

{
  "Register": {
    "100": {
      "Val": 0,
      "Type": 1,
      "UpdatedAt": "2020-02-07T13:44:03.39750918Z"
    }
  }
}

# The application stores persistent data at this path
dataDir: /mnt/ssd/var/data/lobaro-modbus-server/

# Chipstack configuration. Required to manage configured LoRaWAN devices.
chirpstack:
  server: http://localhost:8080
  broker: localhost
  appId: 1
  username: admin
  password: admin

# Modbus configuration. 
# <v1.2.0: Serial mode is fixed at: 8 Data bits, Even Parity, 1 Stop bit (8E1)
modbus:
  baud: 19200
  dataBits: 8 # since v1.2.0
  parity: "even" # no, even (default), odd - since v1.2.0
  stopBits: 1 # 1 (default), 1.5, 2 - since v1.2.0
  slaveId: 1
  port: /dev/ttyUSB0

# Mapping from LoRaWAN Sensors to Modbus Registers
mapping:
  # LoRaWAN Sensor parameters
  - devEUI: 0000000000000000
    appKey: 00000000000000000000000000000000
    # Chirpstack Device Profile to use. Includes the Payload Parser.
    devProfile: lobaro-environment
    devName: "name of device in chirpstack"
    # Register mapping for this device
    # One device can fill any number of registers.
    # The server will check for overlapping definitions on start.
    register:
        # Modbus Address (do NOT prefix with 0, else it's octal)
      - addr: 1
        # The value to be mapped.
        # Usually the value is taken from the Chirpstack Parser result JSON
        # and can be selected via JSON Path as handled by https://github.com/tidwall/gjson
        # There are some special values:
        # @age - age of last update in minutes (for any register of this device)
        # @now - Current time as Unix Timestamp
        value: "@age" # age of last update in minutes (for any register of this device)
        # Data type of the value. Default byte order is LittleEndian
        # Supported types are: int16, uint16 (more will come in future versions)
        type: int16
        # The value is only for messages on the specified port, 0 for "every". Default: 0
        port: 0
        # The register value is multiplied with the given factor, 0 is irgnored. Default: 1
        factor: 1

      - addr: 2
        port: 1 # status packet
        value: "object.vBat"
        type: int16
        factor: 1000
      - addr: 3
        port: 2
        value: "object.temperature"
        type: int16
        factor: 10
      - addr: 4
        port: 2
        value: "object.humidity"
        type: int16
        factor: 10
      - addr: 5
        port: 2
        value: "object.pressure"
        type: int16
        factor: 10
      - addr: 6
        port: 2
        value: "rxInfo.0.rssi"
        type: int16
      - addr: 7
        port: 2
        value: "txInfo.dr"
        type: int16
	  - addr: 8
		port: 128
		value: "0x0102" # value to be sent as downlink, either as hex (prefixed with "0x") or base64 string
		type: downlink

  # A second device as example
  - devEUI: 0000000000000000
    appKey: 00000000000000000000000000000000
    devProfile: lobaro-one-wire
    register:
      - addr: 100
        value: "@age" # age of last update in minutes (for any register of this device)
        type: int16
      - addr: 101
        port: 1 # status packet
        value: "object.vBat"
        type: int16
        factor: 1000
      - addr: 102
        port: 2
        value: "object.sensors.0.temp"
        type: int16
        factor: 10
      - addr: 103
        port: 2
        value: "rxInfo.0.rssi"
        type: int16
      - addr: 104
        port: 2
        value: "txInfo.dr"
        type: int16
      - addr: 105
		port: 128
		value: "dGVzdF9kb3dubGluaw==" # value to be sent as downlink, either as hex (prefixed with "0x") or base64 string
		type: downlink
	  - addr: 106
        type: downlink-var
        len: 5 # 107-111

mapping:
    register:
      - addr: 8
        port: 128
        value: "0x0102" # value to be sent as downlink, either as hex (prefixed with "0x") or base64 string
        type: downlink

~/enableWriteAccess.sh

passwd

sudo vim /etc/network/interfaces

pi@LoRaGateway:~ $ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

# DHCP (Default, comment line to disable DHCP)
iface eth0 inet manual

# Fixed IP (Uncomment to enable or use /etc/dhcpcd.conf)
#auto eth0
#iface eth0 inet static
#    address 10.0.0.42/24
#    gateway 10.0.0.1

sudo vim /etc/dhcpcd.conf

# RAK_eth0_IP
profile static_eth0
static ip_address=192.168.0.1/24
static routers=192.168.0.1

interface eth0
fallback static_eth0