Assign a number to "ni" through a variable

Sato

Hello,
How to assign a number to the widget "ni" through a variable
mqttClient.publish(&In[0], "@ni1 VAL:1234\n\r"); // works, but not what I need

byte tmp = 27;
mqttClient.publish(&In[0], "@ni3 VAL:tmp\n\r"); // not work
mqttClient.publish(&In[0], "@ni3 VAL:&tmp\n\r"); // not work

String strtmp = "81";
mqttClient.publish(&In[0], "@ni2 VAL:&strtmp\n\r");// not work

How can this be done?

Best Regards

kl3m3n

@sato Hello,

One way (you can adapt the buffer size to your needs and you should also check the return value of snprintf):

int val = 1234;
char buf[50];
snprintf(buf, 50, "@ni1 VAL:%d\n\r", val);

mqttClient.publish(&In[0], buf);

You could also build a String object:

String str = "@ni1 VAL:" + String(val) + "\n\r";

mqttClient.publish(&In[0], &str[0]);

Regards,
kl3m3n

Sato

This works and is simpler. You are the best!

String str = "@ni1 VAL:" + String(val) + "\n\r";
mqttClient.publish(&In[0], &str[0]);

Best regards