Relay gateway application runs on Ci40 board with Relay click inserted in click interface. It acts as AwaL2MWM client and connects to Creator Device Server.
The device server is a LWM2M management server designed to be implemented alongside third party cloud services to integrate M2M capability into an IoT application. The device server exposes two secure interfaces; REST API/HTTPs and LWM2M/CoAP.
Relay gateway app defines IPSO 3201 (DigitalOutput) object and subscribes to it's resource 5550 (DigitalOutputState) change. Mobile app can control that resource by sending request to Device Server using REST API. Upon message receipt Ci40 app is changing relay state according to current IPSO resource value.
Relay gateway application serves the purpose of:
- It acts as Awalwm2m client
- It communicates with device server
| Object Name | Object ID | Resource Name | Resource ID |
|---|---|---|---|
| RelayDevice | 3201 | DigitalOutputState | 5550 |
Relay click should be inserted on Ci40 in Mikrobus slot 1.
Application needs valid certificate to communicate with Creator Device Server. Process of providing certificate for the app is called provisioning.
You can obtain certificate by logging to creator developer console and selecting Identities > Certificates > Get Certificate. Then copy this certificate on Ci40 under /etc/config/relay_gateway.crt
This process is shown on image below
App needs to know where your bootstrap server is. Put your bootstrap URL in application config file that can be found under /etc/config/relay_gateway.cfg
Please refer OpenWrt-SDK-build-instructions for exact build instructions.
Relay gateway application can be started from the command line as:
$ relay_gateway_appd
Output looks something similar to this :
Relay Gateway Application
------------------------
Looking for certificate file under : /etc/config/relay_gateway.crt
Certificate found.
Observing IPSO object on path /3201/0/5550
Value of resource /3201/0/5550 changed to: 1
Changed relay state on Ci40 board to 1
Value of resource /3201/0/5550 changed to: 0
Changed relay state on Ci40 board to 0