I have tested various downlink messages with TTN - where simple hex string can be sent, and the messages work fine.
Now I am using ChirpStack and I am trying send downlink message using the Application/AppID/Device/DevID interface screen under “Enqueue downlink payload”. My downlink message consists of First 7 characters as keyword followed by 2 bytes translated from INT – the following is one sample
0x2B 0x55 0x43 0x4C 0x42 0x41 0x4C 0x00 0x64
which is hex translation of --> +UCLBAL100
How can I send this through in ChirpStack? How do I translate this to base64 string?