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{ config, lib, pkgs, ... }:
# Replacement for powerraw.shack pollin box
# Requires usb-serial device on host
# Requires mqtt available at mqtt.shack
# Requires hostname powerraw.shack
let
influx-url = "http://influx.shack:8086";
pkg = pkgs.python3.pkgs.callPackage (
pkgs.fetchFromGitHub {
owner = "shackspace";
repo = "powermeter";
rev = "438b08f";
sha256 = "0c5czmrwlw985b7ia6077mfrvbf2fq51iajb481pgqbywgxqis5m";
}) {};
in {
# receive response from light.shack / standby.shack
networking.firewall.allowedUDPPorts = [ 11111 ];
networking.firewall.allowedTCPPorts = [ 11111 ];
users.users.powermeter = {
extraGroups = [ "dialout" ];
isSystemUser = true;
group = "powermeter";
};
users.groups.powermeter = {};
# we make sure that usb-ttl has the correct permissions
# creates /dev/powerraw
services.udev.extraRules = ''
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="powerraw", MODE="0660", GROUP="dialout"
'';
systemd.services.powermeter-serial2mqtt = {
description = "powerraw Serial -> mqtt";
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = "powermeter";
ExecStart = "${pkg}/bin/powermeter-serial2mqtt /dev/powerraw";
PrivateTmp = true;
Restart = "always";
RestartSec = "15";
};
};
systemd.services.powermeter-mqtt2socket = {
description = "powerraw mqtt -> raw socket 11111";
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = "powermeter";
ExecStart = "${pkg}/bin/powermeter-mqtt2socket";
PrivateTmp = true;
Restart = "always";
RestartSec = "15";
};
};
services.telegraf = {
enable = true;
extraConfig = {
agent.debug = false;
outputs = {
influxdb = [{
urls = [ influx-url ];
database = "telegraf";
}];
};
};
};
services.telegraf.extraConfig.inputs.mqtt_consumer = let
genTopic = name: topic: tags: {
servers = [ "tcp://mqtt.shack:1883" ];
qos = 0;
connection_timeout = "30s";
topics = [ topic ];
inherit tags;
persistent_session = false;
name_override = name;
data_format = "value";
data_type = "float";
};
sensor = "total";
types = [ "Voltage" "Current" "Power" ];
phases = [ "1" "2" "3" ];
in
[ (genTopic "Power consumed" "/power/${sensor}/consumed" { inherit sensor; }) ] ++
(lib.flatten (map (type: (map (phase: (genTopic "Power" "/power/${sensor}/L${toString phase}/${type}" { inherit sensor phase type; }) ) phases)) types));
}
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