Successful bidder should deliver a Raspberry Pi Data Logger that communicate with field devices using Modbus protocol and store it in DBs (MySQL or Postgre SQL).
The data will then send to another server using SNMP or MQTT language.
SNMP V1, V2C, V3 compatible
MQTT V3, V3.1
The software should be written in cross-platform language or solution such as Java or Phyton.
The solution should also have a web-interface for admin to do simple configuration of DB connection, Modbus metering setup, SNMP or MQTT server connection and etc.