I was able to make use of the CyaSSL embedded SSL code to exchange some data between a client and a server application.
All worked very well as long as I used the certificate that came with the sources of CyaSSL.
But I now need make use of our own certificates.
The very first certificate that I want to use is the CA-certificate that we use in many other applications that do not use CyaSSL.
I use the function Cyassl_ctx_load_verify_locations() which itself calls other functions. One of them is the call to isCA().
This routine should set the cert.isCA flag. But when this routine is called with our ca-certificate this flag is nog set.
out certificate look like:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            77:ed:bc:7a:05:61:56:91:4a:c0:71:39:4c:90:9c:a7
        Signature Algorithm: sha1WithRSAEncryption
        Issuer: DC=corp, DC=rabobank, CN=Rabobank Group Root CA
        Validity
            Not Before: Feb 12 09:36:27 2008 GMT
            Not After : Feb 12 09:43:49 2028 GMT
        Subject: DC=corp, DC=rabobank, CN=Rabobank Group Root CA
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
            RSA Public Key: (4096 bit)
                Modulus (4096 bit):
                    00:e1:e0:b6:6f:d4:a6:34:77:34:16:30:6c:7f:a9:
                    b6:f3:96:78:2e:e1:7d:34:64:3d:ee:48:7e:d9:a3:
                    d8:fd:c1:1a:18:be:5a:82:f3:32:2e:f3:5d:06:31:
                    09:b3:30:55:61:7c:7d:3b:55:d7:41:d2:fc:2f:e4:
                    ba:48:12:27:0e:21:ed:05:6c:cb:4e:85:6a:3a:8d:
                    db:80:92:a0:2b:10:9a:1d:bd:8a:3c:31:32:49:81:
                    a5:56:1c:77:f4:37:26:47:80:bc:91:29:7d:18:76:
                    8b:ab:30:db:16:df:50:7f:22:00:e0:3d:48:a8:7e:
                    e1:7b:3d:7c:3d:c1:9d:4a:32:98:7a:0d:d1:b7:a3:
                    57:c8:ab:44:9d:24:c9:78:5d:79:bf:53:fd:2c:63:
                    8b:f9:70:05:14:19:67:e2:63:b6:5e:70:4c:7e:db:
                    ea:6b:d6:fa:8e:0b:f2:93:79:b8:24:b0:12:ec:94:
                    fe:8e:ae:21:a1:ed:66:86:92:5d:7b:96:21:50:f3:
                    4f:f0:a3:d4:40:a9:bc:4c:91:d8:15:8c:37:8e:30:
                    d5:3d:60:93:4a:cc:cc:2e:0c:fe:d4:36:ab:49:02:
                    f2:46:57:d8:ff:ca:8d:15:c3:5b:5f:32:d5:d5:c7:
                    a6:ff:fc:f9:c9:2b:a8:c4:21:37:bb:79:6d:0d:b5:
                    74:dc:9d:cb:d4:e6:38:fb:8e:0e:c2:34:5a:9b:50:
                    00:5a:d9:71:5e:b8:a0:fc:8b:7d:ee:e2:1f:9e:77:
                    03:9b:ef:57:70:a9:eb:09:93:02:ff:a1:92:88:a1:
                    15:30:71:40:62:46:29:b4:45:35:6e:12:ff:13:55:
                    d4:f0:53:b5:2e:1a:cb:cb:44:d6:96:ad:33:4b:1f:
                    52:a5:64:3e:ea:e1:77:75:f3:31:93:7f:74:17:62:
                    44:8c:33:f1:cd:51:d8:1d:06:4c:94:f5:99:2c:37:
                    d0:fc:ae:3b:42:f9:36:c7:91:9d:40:af:de:8a:47:
                    dd:39:66:4c:3a:c9:68:30:7b:0b:d5:99:e0:e7:bf:
                    12:f0:a0:e3:6b:5f:07:66:42:96:f6:2a:7b:28:6a:
                    7e:b3:45:75:be:02:3f:e6:03:97:3b:e4:b6:b3:e8:
                    13:0a:17:ba:7c:fb:82:af:45:03:66:fc:4c:6a:20:
                    cc:fb:42:d3:99:e9:03:66:92:0f:01:1d:2e:a7:82:
                    52:b4:d5:e8:93:18:7c:77:4f:f2:51:9b:b3:bf:89:
                    51:e3:b9:39:b2:b5:42:d7:cc:13:92:4f:86:b0:c6:
                    c4:c7:79:20:c5:3b:1e:0d:64:47:37:f2:ae:30:24:
                    66:93:2e:29:dc:a5:28:84:7a:41:ed:2a:12:77:8b:
                    99:ea:1f
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Key Usage:
            Digital Signature, Certificate Sign, CRL Sign
            X509v3 Basic Constraints: critical
            CA:TRUE
            X509v3 Subject Key Identifier:
            D2:CC:AA:90:10:5A:D8:D1:94:9A:C2:EC:B7:B9:6C:09:19:4C:83:8B
            1.3.6.1.4.1.311.21.1:
                ...
    Signature Algorithm: sha1WithRSAEncryption
        70:f2:b0:ba:22:d2:13:6e:9a:25:4c:db:b1:2d:73:d2:ba:c3:
        6b:1c:1d:d7:f0:23:2f:72:9e:79:1f:b7:cc:14:12:a2:49:ac:
        6d:24:4f:0f:46:1f:70:46:e9:50:d0:dc:46:24:ad:8e:70:45:
        e3:be:f8:e8:8f:de:0d:35:c4:49:74:c9:d6:3e:96:dc:47:99:
        62:6c:13:f5:f1:17:84:b2:7d:a7:68:63:c3:06:ab:84:9a:2f:
        e2:04:d7:48:8c:3c:ea:4a:64:a8:13:c7:64:91:28:03:68:6b:
        6b:cc:fe:77:95:f3:63:9e:4a:a0:d2:2b:94:ac:97:1d:fc:10:
        cd:d0:6c:dd:ce:c2:79:ec:7d:5a:d3:b3:a0:c0:a1:d0:1b:9f:
        b8:a4:78:0b:b3:1d:8e:3a:c5:20:b8:f3:1a:f1:30:0b:37:e4:
        53:0f:48:22:20:0b:a0:8f:6d:b3:cb:71:6e:11:b9:97:23:dc:
        09:1a:09:63:2b:ca:4e:4c:5d:c9:8b:65:e0:1d:89:5d:dd:75:
        e9:2a:cb:4b:10:3c:8e:02:f3:42:52:5d:c2:7d:83:68:1d:0d:
        68:20:35:3f:46:19:cb:81:fb:a0:69:13:f9:4e:d7:bc:96:e8:
        d6:0f:29:bc:af:fd:ab:23:2a:e7:7f:0f:e8:cc:32:f4:38:22:
        28:ef:1e:6b:b0:f2:07:1e:f7:7d:4d:57:ea:13:0d:8c:1b:3f:
        13:de:13:4f:2c:12:db:c0:3d:96:21:ee:7d:c5:d0:01:79:43:
        34:16:22:aa:12:84:20:83:4b:45:a0:34:bf:fe:31:20:32:7e:
        47:d7:86:28:e4:ad:44:0c:df:cb:1f:bb:aa:b7:6d:18:09:17:
        c8:a8:26:35:88:cc:0f:80:b2:6a:43:e9:cb:f3:5a:e8:59:10:
        05:08:48:57:0b:2d:cc:db:1a:1f:38:e0:8f:47:c2:d6:39:43:
        a2:a8:7a:4d:80:55:ad:aa:d9:71:b2:42:fb:23:a2:00:e9:65:
        2a:9c:49:be:75:60:75:9e:ff:5d:4e:91:d6:f7:97:8f:5b:00:
        1d:a3:11:43:4c:8e:87:51:08:4a:0e:c6:3f:5f:c5:93:68:ea:
        b6:17:16:6c:d8:7b:b2:ad:ee:3a:24:d4:62:4f:0b:b0:df:d2:
        52:1d:e6:c4:93:58:b2:0b:80:af:38:9e:df:21:63:fb:f8:31:
        5d:56:d2:07:66:0d:c2:e9:86:29:16:56:33:f5:ec:ef:f7:4c:
        70:18:de:d2:1f:5b:38:27:3f:c8:1d:01:a7:85:72:dd:34:c6:
        da:f2:77:99:20:eb:16:9d:20:fe:0b:8c:4b:88:41:0d:da:da:
        cf:10:73:b3:71:fc:49:6a
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----