NOISSUE - Modbus Adpater

[SammyOina]

What does this do?

Creates Modbus adapter on mainflux

Which issue(s) does this PR fix/relate to?

https://github.com/ultravioletrs/issues/issues/278

List any changes that modify/break current functionality

Have you included tests for your changes?

Did you document any new/modified functionality?

Notes

To test using a simulated device,

version: "2.1"
services:
  modbus:
    image: techplex/modbus-sim:latest
    container_name: modbus
    ports:
      - 1502:1502
    restart: unless-stopped

use the following to start reading:

mosquitto_pub -u aee63940-5c05-4c0c-afb8-2fb9cd304d9d -P b81b36b6-523e-4413-9405-d694e0feda4b -t channels/e90158ff-cc68-405a-9781-e145389f9448/messages/modbus/read/tcp/h_register -h localhost -m '{
        "config": {
                "address": "localhost:1502"
        },
        "options": {
                "address": 100,
                "quantity": 1
        }
}' -i desk

Get responses via:

coap-cli-linux get channels/e90158ff-cc68-405a-9781-e145389f9448/messages/modbus/res -auth b81b36b6-523e-4413-9405-d694e0feda4b -o

known issues: the message output is not clear output in terminal, maybe due to the message type on coap

[codecov]

Codecov Report

Merging #1882 (9db71fe) into master (9dbe87f) will decrease coverage by 1.21%.
The diff coverage is 15.27%.

@@            Coverage Diff             @@
##           master    #1882      +/-   ##
==========================================
- Coverage   67.16%   65.95%   -1.21%     
==========================================
  Files         118      120       +2     
  Lines        9076     9292     +216     
==========================================
+ Hits         6096     6129      +33     
- Misses       2351     2528     +177     
- Partials      629      635       +6     

Files Changed	Coverage Δ
modbus/adapter.go	0.00% <0.00%> (ø)
modbus/modbus.go	25.58% <25.58%> (ø)

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[drasko]

PR moved here: mainflux/edge#1