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NRFJPROG_rtt_write in nrf52_nrfjprog.dll won't write more than 15 characters

I'm trying to pass a string longer than 15 characters to NRFJPROG_rtt_write (it's 17 characters, including null-termination), but the data_written parameter is set to 15 after the call. In addition, only 15 characters get sent down to the nRF52. I check that with the debugger. There's only 15 characters in the receive buffer on my target device.

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