Fix: Allow higher-resolution SoC in live view header (#1197)

Commit accc70d added the battery SoC to
the live view header. But due to getSoC() returning an int,
the precision was limited.

This changes getSoC() to return float so when a source with higher
precision is available, the respective precision is shown.

include/BatteryStats.h

@@ -18,7 +18,7 @@ class BatteryStats {
         uint32_t getAgeSeconds() const { return (millis() - _lastUpdate) / 1000; }
         bool updateAvailable(uint32_t since) const;
 
-        uint8_t getSoC() const { return _soc; }
+        float getSoC() const { return _soc; }
         uint32_t getSoCAgeSeconds() const { return (millis() - _lastUpdateSoC) / 1000; }
         uint8_t getSoCPrecision() const { return _socPrecision; }
 

src/PowerLimiter.cpp

@@ -266,7 +266,7 @@ void PowerLimiterClass::loop()
     _batteryDischargeEnabled = getBatteryPower();
 
     if (_verboseLogging && !config.PowerLimiter.IsInverterSolarPowered) {
-        MessageOutput.printf("[DPL::loop] battery interface %s, SoC: %d %%, StartTH: %d %%, StopTH: %d %%, SoC age: %d s, ignore: %s\r\n",
+        MessageOutput.printf("[DPL::loop] battery interface %s, SoC: %f %%, StartTH: %d %%, StopTH: %d %%, SoC age: %d s, ignore: %s\r\n",
                 (config.Battery.Enabled?"enabled":"disabled"),
                 Battery.getStats()->getSoC(),
                 config.PowerLimiter.BatterySocStartThreshold,

src/PylontechCanReceiver.cpp

@@ -31,7 +31,7 @@ void PylontechCanReceiver::onMessage(twai_message_t rx_message)
             _stats->_stateOfHealth = this->readUnsignedInt16(rx_message.data + 2);
 
             if (_verboseLogging) {
-                MessageOutput.printf("[Pylontech] soc: %d soh: %d\r\n",
+                MessageOutput.printf("[Pylontech] soc: %f soh: %d\r\n",
                         _stats->getSoC(), _stats->_stateOfHealth);
             }
             break;

src/PytesCanReceiver.cpp

@@ -32,7 +32,7 @@ void PytesCanReceiver::onMessage(twai_message_t rx_message)
             _stats->_stateOfHealth = this->readUnsignedInt16(rx_message.data + 2);
 
             if (_verboseLogging) {
-                MessageOutput.printf("[Pytes] soc: %d soh: %d\r\n",
+                MessageOutput.printf("[Pytes] soc: %f soh: %d\r\n",
                         _stats->getSoC(), _stats->_stateOfHealth);
             }
             break;