Pointer to structure for addReadWriteStringHandler results in SNMP no such object about arduino_snmp HOT 6 OPEN

That line did come out right above, should be:

snmp->addReadWriteStringHandler(".1.3.6.1.4.1.38218.1.3.1.0", (char**)(*conf).sensor_name, 40, true);

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Hi @dmarc1234.
What is the type of (*conf).sensor_name?
If it is a char*, then you'll need to pass the reference of it to addReadWriteStringHandler().
For example: snmp->addReadWriteStringHandler(".1.3.6.1.4.1.38218.1.3.1.0", &(*conf).sensor_name, 40, true);
You shouldn't need to cast it to a char** unless it's not a char* originally.

Let me know if that helps!. Thanks.

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Thank you for your reply.

Yes, (*conf).sensor_name is a char within the CONFIG_REG structure.

I have tried:
snmp->addReadWriteStringHandler(".1.3.6.1.4.1.38218.1.3.1.0", &(*conf).sensor_name, 40, true);
but it will not compile, I need to cast to char** to make it compile, so:
snmp->addReadWriteStringHandler(".1.3.6.1.4.1.38218.1.3.1.0", (char**)&(*conf).client_name, 40, true);
which compiles but still results in a SNMP no such object error.

Also tried a different approach as follows:

CONFIG_REG *config = &configReg;
snmp->addReadWriteStringHandler(".1.3.6.1.4.1.38218.1.3.1.0", (char**)&config->sensor_name, 40, true);

which returns a blank string rather than the no object error.

Really not sure where to go next ?

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@dmarc1234 Can you show me the declaration of the CONFIG_REG type? What data type is sensor_name?

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This is how CONFIG_REG is defined:

// Structure to contain configuration information
typedef struct
{
	char		sensor_name[40];		// Sensor name
	char		sensor_location[40];	// Sensor location
} CONFIG_REG;

and then declared as a global in main.c :
CONFIG_REG configReg;

I then create a pointer to it using:
CONFIG_REG *config = &configReg;

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@0neblock did you see my message in relation to the structure, still struggling to get this to work.

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