simple-fota-example.js - README tip & improve logs

[JanneKiiskila]

Mbed Edge Examples pull request

Description

Add the tip on the manifest file (vendor and class ID). Add a bit more logging to the example.

Test instructions

Password: 
[EdgePTExample] Press any key to connect Edge.
[EdgePTExample] Connecting to " ws+unix:///tmp/edge.sock:/1/pt "
[EdgePTExample] Connected to Edge
[EdgePTExample] Press any key to register as protocol translator.
[EdgePTExample] Registered as protocol translator. Response: ok
[EdgePTExample] Press any key to register the example device.
[EdgePTExample] Registered an example device. Response: ok
[EdgePTExample] Subdevice FOTA can be started.
[EdgePTExample] Press any key to update example device values.
[EdgePTExample] Received FOTA request
{
  classid: 'U1VCREVWSUNFLS1DTEFTUw==',
  component_name: 'MAIN',
  operation: 4,
  size: 5027472,
  uri: { deviceId: 'example-fota-device' },
  vendorid: 'U1VCREVWSUNFLVZFTkRPUg==',
  version: 'MC4xLjA='
}
[EdgePTExample] Class ID  :  SUBDEVICE--CLASS
[EdgePTExample] Vendor ID :  SUBDEVICE-VENDOR
[EdgePTExample] FW version:  0.1.0
[EdgePTExample] Updating Device, Firmware file location /tmp/MAIN-36028797019029504.bin
[EdgePTExample] Rebooting device.
[EdgePTExample] Manifest Resource updated, Device is updated
[EdgePTExample] Press any key to unregister the example device

Check list

Changelog

• CHANGELOG.md updated.

[jenia81]

LGTM
Small fix me in the readme