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Tasmota / OBIS sm API protocol
[[File:CLS-HAN.png|thumb|CLS in HAN]]
Imagine, you are generating electricity from solar power coming from your house’s roof to charge your electric vehicle in your garage, which is connected to a wall box. Now the grid’s frequency turns suddenly low, and the grid operator decides to dump “unnecessary” load. Your CLS will be turned off. The excessive electricity from your roof will be immediately diverted to the grid to have it furthermore stabilized. You get 8ct per kWh for tis stunt, but your car remains uncharged. A similar doomed situation occurs if grid frequency rises. Your solar export to the grid will be just cut off by commanding the inverters to reduce efficiency by frequency manipulation. The electric vehicle is charged with grid power at 50 ct/kWh. Your customer data record at the energy supplier and the grid operator will contain and release the information about the possibility of remotely deactivating import or export to the grid. This information is exchanged through UN/CEFACT BDEW UTILMD PID 55112/55113/55114
[[File:BDEW UTILMD PID.png|thumb|UN/CEFACT BDEW UTILMD PID 55112/55113/55114]]
WAN communication from the SMGW is based exclusively on GSM or Power Line Communication (PLC) protocols and effectively do form an ISO/OSI stack IP network which can be tunneled through the internet by SLL for cost effectiveness. Payload will be always encrypted on the byte level
Please note, routing is not available between these networks: LMN, HAN and WAN trough the smart meter gateway. It purely acts as a “bridge”, receiving messages from one network and sending different messages but accordingly to the purpose, to another attached network.
====== Reading Smart Meter Information ======
[[File:FlashlightPIN.png|alt=https://www.youtube.com/watch?v=zqpaXnFCUYQ|thumb|entering PIN with a flashlight]]
[[File:SM reader writer.png|alt=https://amzn.eu/d/c23GH7Z|thumb|Tasmota based reader writer]]
Most smart meters in Germany are equipped with an bidirectional ifrared-port (actually two ports: one for TX and one for RX) for sending and receiving data. This port will send additional metering information if activated. This includes momentary power import/export to and from the grid and voltage in different phases (L1, L2, L3). Activation is protected by a 4-digit PIN, which is (for data protection reasons) only available from the company owning the meter, or if unconfigured "0000" as a factory default. To activate the sending of additional metering data, the pin has to be entered by using a simple flashlight. Here's a [https://www.youtube.com/watch?v=zqpaXnFCUYQ video] showing, how this is done. PIN protetion can be permanaently deactivated. After successfull activation, the meter can be configured by sending serial communication commands via the ir port. After configuration the meter will transmit the information requested via the ir-port. Users communicate with these meters via diy-style serial opto-couples via cable link or WiFi. Freelyavailable [https://www.tasmota.info/ Tasmota] software based soultions do make use of inexpensive microcontrollers (ESP8266 ESP32) for that purpose. There is a description of the smart meter interface API, running an OBIS-Protocol [https://tasmota.github.io/docs/Smart-Meter-Interface/ here].
'''Example of the OBIS communication protocol:'''
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"/KFM5KAIFA-METER\r"} 09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-3:0.2.8(42)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:1.0.0(200913101618S)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.1.1(4530303235303030303639363432393136)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:1.8.1(005779.835*kWh)\r"} 09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:1.8.2(005583.617*kWh)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:2.8.1(000000.000*kWh)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:2.8.2(000000.000*kWh)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.14.0(0001)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:1.7.0(00.498*kW)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:2.7.0(00.000*kW)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.7.21(00000)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.7.9(00000)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:99.97.0(1)(0-0:96.7.19)(000101000001W)(2147483647*s)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:32.32.0(00000)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:32.36.0(00000)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.13.1()\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-0:96.13.0()\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:31.7.0(002*A)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:21.7.0(00.496*kW)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"1-0:22.7.0(00.000*kW)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-1:24.1.0(003)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-1:96.1.0(4730303332353631323736373836373136)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"0-1:24.2.1(200913100000S)(04139.079*m3)\r"}</code>
<code>09:16:17 MQT: tele/wemos-9/RESULT = {"SerialReceived":"!F798\r"}</code>
=Chapter 2 Public Key Infrastructure=