A simple and lightweight ( but not full feature ) lwm2m server aim to run on edge router.

• Bootstrap Interface
• Client Registration interface.
  • Register
  • Update
  • Deregister
• Device Management and Service Enablement interface.
  • Read Operation, Read Resource, Read Object
  • Write Operation, Write Resource, Write Object Instance
  • Execute Operation
  • Discover Operation
  • Create Operation
  • Delete Operation
  • Write-Attributes Operation
  • Read-Composite Operation
  • Write-Composite Operation
• Information Reporting interface.
  • Observe Operation, Observe Resource, Observe Object
  • Cancel Observation Operation
  • Observe-Composite Operation
  • Cancel Observation-Composite Operation
  • Send Operation
• Data formats
  • Plain Text
  • Opaque
  • CBOR
  • TLV
  • SenML JSON
  • SenML CBOR
  • LwM2M JSON
• Security
  • DTLS with Certificates
  • DTLS with PSK, only support DTLS 1.2
• Transport
  • UDP transport support.
  • TCP transport support.(Some features may not work properly)
• Tested with clients
  • Leshan client: coap, coaps + psk
  • Anjay client running on ESP32: coap
  • Anjay client running on Linux: coap, coaps + psk
  • Zephyr LWM2M client running on nrf52840 with w5500 ethernet: coap, coaps + psk
  • Zephyr LWM2M client running on nrf52840 with Openthread

You need a working Go environment.

go get github.com/yplam/lwm2m

package main

import (
  "github.com/yplam/lwm2m/core"
  "github.com/yplam/lwm2m/registration"
  "github.com/yplam/lwm2m/server"
  "log"
)

func main() {
  r := server.DefaultRouter()
  deviceManager := core.DefaultManager()
  registration.EnableHandler(r, deviceManager)
  err := server.ListenAndServe(r,
    server.EnableUDPListener("udp", ":5683"),
  )
  if err != nil {
    log.Printf("serve lwm2m with err: %v", err)
  }
}

leshan client

# coap 
java -jar leshan-client-demo.jar --server-url=localhost:5683

# coaps
java -jar leshan-client-demo.jar --server-url=localhost:5684 -i 123 --psk-key=000102030405060708090a0b0c0d0e0f

anjay client

# coap
./output/bin/demo --endpoint-name $(hostname) --server-uri coap://127.0.0.1:5683

# coap + tcp
./output/bin/demo --endpoint-name $(hostname) --server-uri coap+tcp://127.0.0.1:5685

# coaps
./output/bin/demo --endpoint-name $(hostname) --server-uri coaps://127.0.0.1:5684 --security-mode psk --identity 666f6f --key 000102030405060708090a0b0c0d0e0f --ciphersuites 49320 --tls-version TLSv1.2

Apache License Version 2.0. See the LICENSE file for details.