Feature: auto-detect SoC precision for MQTT Battery provider

hoylabs · Dec 7, 2024 · bb59ca6 · bb59ca6
1 parent 240918b
commit bb59ca6
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Showing 2 changed files with 13 additions and 3 deletions.
diff --git a/include/MqttBattery.h b/include/MqttBattery.h
@@ -19,6 +19,7 @@ class MqttBattery : public BatteryProvider {
     String _voltageTopic;
     String _dischargeCurrentLimitTopic;
     std::shared_ptr<MqttBatteryStats> _stats = std::make_shared<MqttBatteryStats>();
+    uint8_t _socPrecision = 0;
 
     void onMqttMessageSoC(espMqttClientTypes::MessageProperties const& properties,
             char const* topic, uint8_t const* payload, size_t len, size_t index, size_t total,

diff --git a/src/MqttBattery.cpp b/src/MqttBattery.cpp
@@ -98,11 +98,20 @@ void MqttBattery::onMqttMessageSoC(espMqttClientTypes::MessageProperties const&
         return;
     }
 
-    _stats->setSoC(*soc, 0/*precision*/, millis());
+    unsigned factor = 10;
+    uint8_t precision = 0;
+    while (precision < 2) {
+        if (std::floor(*soc * factor) == std::floor(*soc) * factor) { break; }
+        ++precision;
+        factor *= 10;
+    }
+    _socPrecision = std::max(_socPrecision, precision);
+
+    _stats->setSoC(*soc, _socPrecision, millis());
 
     if (_verboseLogging) {
-        MessageOutput.printf("MqttBattery: Updated SoC to %d from '%s'\r\n",
-                static_cast<uint8_t>(*soc), topic);
+        MessageOutput.printf("MqttBattery: Updated SoC to %.*f from '%s'\r\n",
+                _socPrecision, *soc, topic);
     }
 }