DPL requirement: disabled inverter commands

if the inverter is not configured to be sent commands to, the DPL is
unable to control it, so the loop is aborted.

include/PowerLimiter.h

@@ -33,6 +33,7 @@ class PowerLimiterClass {
         PowerMeterPending,
         InverterInvalid,
         InverterOffline,
+        InverterCommandsDisabled,
         InverterLimitPending,
         InverterPowerCmdPending,
         InverterStatsPending,

src/PowerLimiter.cpp

@@ -34,6 +34,7 @@ std::string const& PowerLimiterClass::getStatusText(PowerLimiterClass::Status st
         { Status::PowerMeterPending, "waiting for sufficiently recent power meter reading" },
         { Status::InverterInvalid, "invalid inverter selection/configuration" },
         { Status::InverterOffline, "inverter is offline (polling enabled? radio okay?)" },
+        { Status::InverterCommandsDisabled, "inverter configuration prohibits sending commands" },
         { Status::InverterLimitPending, "waiting for a power limit command to complete" },
         { Status::InverterPowerCmdPending, "waiting for a start/stop/restart command to complete" },
         { Status::InverterStatsPending, "waiting for sufficiently recent inverter data" },
@@ -124,6 +125,11 @@ void PowerLimiterClass::loop()
         return announceStatus(Status::InverterOffline);
     }
 
+    // sending commands to the inverter is disabled
+    if (!_inverter->getEnableCommands()) {
+        return announceStatus(Status::InverterCommandsDisabled);
+    }
+
     // concerns active power commands (power limits) only (also from web app or MQTT)
     auto lastLimitCommandState = inverter->SystemConfigPara()->getLastLimitCommandSuccess();
     if (CMD_PENDING == lastLimitCommandState) {