CLIENT_GW_MQTT / Setup and automatisation of Presentation and set/req

[maxtox]

Hi,

just writing a sketch, which i want to share later on wit ALL who wants to have an MEGA as client, sensor node and GW ...

AT first i want to have a overview over all my pins at MEGA 2560 and see what they "are".

So i started with setting a String Array for 80 PINS:

String iomodus[80][3] = { 
//"presentation", "set/req", "description"
{„0“,                       “0“,              “free“},
{„0“,“0“,“free“}, 
{"S_BINARY","V_STATUS","test switch"}, //D3
{„0“,“0“,“free“}, //D4
...
{„0“,“0“,“free“}, //D80
};

1. i want to present sensors ...and here is my problem...

I want to convert String rows to uint8_t to make a procedure to let the sketch present all my sensors. where
i= CHILD_ID
iomodus[i][1st COLUMN] = presentation ID
iomodus[i][3rd COLUMN] = description as Text
ACK= true

void presentation()  
{   
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Relay+Max31855", "1.0");

for (int i = 0; i<70; i++) //all Ports D0 bis D69

//present(uint8_t childSensorId, uint8_t sensorType, const char *description, bool enableAck)
present(i, iomodus[i][1], iomodus[i][3], true);
}

does no work!!!

and says :

**cannot convert 'String' to 'uint8_t {aka unsigned char}' for argument '2' to 'void present(uint8_t, uint8_t, const char*, bool)'**

2. Want to set Variables/Topics to my controller with...
   iomodus[i][2nd column]
   Could you please help me to solv this...

tried 6h everything i knew (pointers etc..) but no luck...

Thank you in Advance!