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Home Assistant Integration of Moj Elektro electricity meter

This is custom component for integrating electric utility meter data into Home Assistant.
As mojelektro.si requires 2 factor authentication, this solution uses key-cert login.
Unfortunately self signed certs don't works as it needs to be signed by one of the following CA

Acceptable client certificate CA names
C = SI, O = ACNLB
C = SI, O = POSTA, OU = POSTArCA
C = SI, O = Halcom, CN = Halcom CA FO
C = SI, O = Halcom, CN = Halcom CA PO 2
C = SI, O = Halcom d.d., CN = Halcom CA PO 3
C = SI, O = OSI d.o.o., CN = OSI.SI Root CA 1
C = si, O = state-institutions, OU = sigen-ca
C = si, O = state-institutions, OU = sigov-ca
C = SI, O = OSI d.o.o., CN = OSI.SI Private CA 1
C = SI, O = NLB d.d., organizationIdentifier = VATSI-91132550, CN = ACNLB SubCA
C = SI, O = NLB d.d., organizationIdentifier = VATSI-91132550, CN = ACNLB RootCA
C = SI, O = Republika Slovenija, organizationIdentifier = VATSI-17659957, CN = SIGOV-CA
C = SI, O = Republika Slovenija, organizationIdentifier = VATSI-17659957, CN = SIGEN-CA G2
C = SI, O = Republika Slovenija, organizationIdentifier = VATSI-17659957, CN = SI-TRUST Root
C = SI, O = POSTA SLOVENIJE d.o.o., organizationIdentifier = VATSI-25028022, CN = POSTArCA G2
C = SI, O = POSTA SLOVENIJE d.o.o., organizationIdentifier = VATSI-25028022, CN = POSTArCA Root
C = SI, O = Halcom d.d., organizationIdentifier = VATSI-43353126, CN = Halcom CA FO e-signature 1
C = SI, O = Halcom d.d., organizationIdentifier = VATSI-43353126, CN = Halcom CA PO e-signature 1
C = SI, O = Halcom d.d., organizationIdentifier = VATSI-43353126, CN = Halcom Root Certificate Authority

Also as the data is always reported for the previous day, and I couldn't find a way to tell HA to log sensor data to the past, data will always be one day off.

(The code is based on https://github.com/home-assistant/example-custom-config/tree/master/custom_components/example_load_platform)

Installation

  1. Copy this folder to <config_dir>/custom_components/mojelektro/.

  2. Copy your certificate key and cert to the folder location from 1.
    You have to name them crt.pem and key.pem. If you only have the .p12 file you can use the following command.

    openssl pkcs12 -in path.p12 -out crt.pem -clcerts -nokeys
openssl pkcs12 -in path.p12 -out key.pem -nocerts -nodes

  3. Add the following entry in your configuration.yaml:

    mojelektro:
  username: <your-email>
  password: <your-password>
  meter_id: <your-meter-id>