save i2c sensor addr as char, use it later with strtol()

Arduino/CanGrow/include/CanGrow.h

@@ -228,6 +228,7 @@ struct Config_System_Sensor {
 
   byte type[Max_Sensors];
   char name[Max_Sensors][32];
+  char i2c_address[Max_Sensors][5];
   byte gpio[Max_Sensors];
 };
 

Arduino/CanGrow/include/CanGrow_LittleFS.h

@@ -234,6 +234,7 @@ bool LoadConfig() {
     if(objSystemSensor["type"][i] > 0) {
       config.system.sensor.type[i] = objSystemSensor["type"][i];
       strlcpy(config.system.sensor.name[i], objSystemSensor["name"][i], sizeof(config.system.sensor.name[i]));
+      strlcpy(config.system.sensor.i2c_address[i], objSystemSensor["i2c_address"][i], sizeof(config.system.sensor.i2c_address[i]));
       // gpio
       config.system.sensor.gpio[i] = objSystemSensor["gpio"][i];
       
@@ -328,6 +329,7 @@ bool SaveConfig(bool writeToSerial = false) {
     if(config.system.sensor.type[i] > 0) {
       objSystemSensor["type"][i] = config.system.sensor.type[i];      
       objSystemSensor["name"][i] = config.system.sensor.name[i];
+      objSystemSensor["i2c_address"][i] = config.system.sensor.i2c_address[i];
       objSystemSensor["gpio"][i] = config.system.sensor.gpio[i];
 
     }

Arduino/CanGrow/include/Webserver/Page_system.h

@@ -974,6 +974,13 @@ String Proc_WebPage_system_sensor_addEdit(const String& var) {
     sensorName.replace("%", "%");
     return sensorName;
     
+  } else if(var == "SENSOR_I2C_ADDRESS") {
+    // "escape" % character, because it would break the template processor.
+    // tasmote webcall for example has percentage char in its path
+    String sensorI2cAddress = config.system.sensor.i2c_address[tmpParam_editSensorId];
+    sensorI2cAddress.replace("%", "%");
+    return sensorI2cAddress;
+    
   } else if(var == "GPIO_INDEX") {
     return Html_SelectOpt_GPIOindex(config.system.sensor.gpio[tmpParam_editSensorId]);
     
@@ -1028,6 +1035,12 @@ void WebPage_system_sensor_add(AsyncWebServerRequest *request) {
       strlcpy(config.system.sensor.name[sensorId], p_name->value().c_str(), sizeof(config.system.sensor.name[sensorId]));
     }
     
+    if(request->hasParam("i2c_address", true)) {
+      const AsyncWebParameter* p_i2c_address = request->getParam("i2c_address", true);
+      Serial.printf(":: [Webserver:system] POST[%s]: %s\n", p_i2c_address->name().c_str(), p_i2c_address->value().c_str());
+      strlcpy(config.system.sensor.i2c_address[sensorId], p_i2c_address->value().c_str(), sizeof(config.system.sensor.i2c_address[sensorId]));
+    }
+    
     if(request->hasParam("gpio", true)) {
       const AsyncWebParameter* p_gpio = request->getParam("gpio", true);
       Serial.printf(":: [Webserver:system] POST[%s]: %s\n", p_gpio->name().c_str(), p_gpio->value().c_str());

Arduino/CanGrow/include/Webserver/Page_system_HTML.h

@@ -278,7 +278,11 @@ const char* Page_system_sensor_add_HTML PROGMEM = R"(%HEADER%
 
 
 <u>Name</u>:<br>
-<input type='text' name='name' maxlength='16' value='%SENSOR_NAME%' required><br>
+<input type='text' name='name' maxlength='32' value='%SENSOR_NAME%' required><br>
+
+<u>I2C address</u>:<br>
+<p>leave empty for default</p>
+<input type='text' name='i2c_address' maxlength='5' value='%SENSOR_I2C_ADDRESS%' required><br>
 
 <u>GPIO</u>:<br>
 <select name='gpio'>