3 PSK problems

PSK contains an odd number of hex-digits

Proxy or agent does not start, message in the proxy or agent log:

invalid PSK in file "/home/zabbix/zabbix_proxy.psk"
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PSK identity string longer than 128 bytes is passed to GnuTLS

In TLS client side log:

gnutls_handshake() failed: -110 The TLS connection was non-properly terminated.
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In TLS server side log.

gnutls_handshake() failed: -90 The SRP username supplied is illegal.
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PSK longer than 32 bytes is passed to mbed TLS (PolarSSL)

In any Zabbix log:

ssl_set_psk(): SSL - Bad input parameters to function
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