I recently bought myself a P1 meter from https://www.homewizard.com/nl/p1-meter/, to obtain insight into my power-usage.
The P1 meter offers via http API information in the format of a json array(s) (example below)
{
"wifi_ssid": "my_ssid",
"wifi_strength": 100,
"smr_version": 50,
"meter_model": "Landis + Gyr GF0010453483287",
"unique_id": "my_unique_power_meter_id",
"active_tariff": 1,
"total_power_import_kwh": 85210.941,
"total_power_import_t1_kwh": 45447.99,
"total_power_import_t2_kwh": 39762.951,
"total_power_export_kwh": 1848.317,
"total_power_export_t1_kwh": 666.244,
"total_power_export_t2_kwh": 1182.073,
"active_power_w": 1580,
"active_power_l1_w": 258,
"active_power_l2_w": 1276,
"active_power_l3_w": 46,
"active_voltage_l1_v": 228.6,
"active_voltage_l2_v": 225.4,
"active_voltage_l3_v": 229.9,
"active_current_l1_a": 1.129,
"active_current_l2_a": 5.661,
"active_current_l3_a": 0.2,
"voltage_sag_l1_count": 2503,
"voltage_sag_l2_count": 18750,
"voltage_sag_l3_count": 57735,
"voltage_swell_l1_count": 649,
"voltage_swell_l2_count": 123,
"voltage_swell_l3_count": 6,
"any_power_fail_count": 8,
"long_power_fail_count": 11,
"total_gas_m3": 11668.551,
"gas_timestamp": 240828023005,
"gas_unique_id": "my_unique_gasmeter_id",
"external": [
{
"unique_id": "my_unique_gasmeter_id",
"type": "gas_meter",
"timestamp": 240828023005,
"value": 11668.551,
"unit": "m3"
}
]
}
The reason i bought this P1 meter is i also have solar panels+converter that switches off with a ‘Grid Overload’ alarm.
But without data/insight i am unable to trace a/the problem and solve it.
As the P1-Meter cannot run an agent i have made (with documentation at https://docs.checkmk.com/latest/en/datasource_programs.html) a datasource python script to get the data in CMK.
The below script should be placed in ~/local/bin/ and made executable.
#!/usr/bin/env python3
# This file should be placed in ~/local/bin/ and used for a monitoring host that has a/the IP of the device
# in combination with a rule for "individual program call instead of agent" as described on the official docs of CheckMK:
# https://docs.checkmk.com/latest/en/datasource_programs.html
#
# The commandline to be used in CheckMK is : this_script_name.py $HOSTADDRESS$
import sys
import json
import requests
address = sys.argv[1]
response = requests.get('http://{}/api/v1/data'.format(address))
parsed = response.json()
# Using For Loop to iterate thru the data offered by the P1-API
# Threshold values are tuned to my own setup, they might need ajustment for others.
def iterate_json(json_obj):
for key, value in json_obj.items():
if isinstance(value, dict):
iterate_json(value)
else:
if key.startswith("active"):
if key.endswith("_w"):
print(f"P {key} watt={value};2100;2200;2300;0;2500 Current Watts:{value}")
if key.endswith("_v"):
print(f"P {key} volt={value};252;253;260;0;300 Current Volts:{value}")
if key.endswith("_a"):
print(f"P {key} amps={value};8;10;15;0;20 Current Amps:{value}")
if key.endswith("tariff"):
print(f"P {key} tariff={value};;;;; Current Tariff:{value}")
# Additional information is available, but not at current needed in my case
# if key.startswith("external"):
# continue
# else:
# print(f"0 {key} - {value}")
print('<<<local>>>')
iterate_json(parsed)
Configuration in CMK : create a rule for individual program call instead of agent for the P1 host:
The above is a 1st attempt , and should be seen as a raw attempt in getting the info whilst flexing/developing my python insights.
As you can see the threshold values are hard-coded, and tuned to my environment.
Also a lot of static (additional-) data i have omitted in the output as in my case i am purely interested in the voltage, watts and amps of my 3-phase powermeter.
I just wanted to share this, as the chance that i am the only one in the world facing this ‘challenge’ are very remote 
- Glowsome
