@fosi Nice work. Each message needs to have a different child id.
Do something similar to this:
MyMessage msgBmeIAQ(CHILD_ID_AQ, V_VAR1);
MyMessage msgBmeGas(CHILD_ID_GAS, V_VAR2);
MyMessage msgBmeIAQA(CHILD_ID_AQA, V_VAR3);
and define them as different numbers.