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If I doclient.publish("/devices/data", data_json.c_str());, it gets compiled, but data doesn't appear in mqtt.

Update :

If I doclient.publish("/devices/data", data_json.c_str());, it gets compiled, but data doesn't appear in mqtt.

Serial.print(data_json.length()); prints 236

If I just do  client.publish("/devices/data", "data_json");, works as well.

Also tried client.publish("/devices/data", data_json.c_str());, no luck.

If I doclient.publish("/devices/data", data_json.c_str());, it gets compiled, but data doesn't appear in mqtt.

Also I i just do client.publish("/devices/data", "data_json");, works as well. Is my json to string conversion correct ?

If I just do client.publish("/devices/data", "data_json");, works as well.

Also tried client.publish("/devices/data", data_json.c_str());, no luck.

Is my json to string conversion correct ?