|
| From: | Richmond Umagat |
| Subject: | [lwip-devel] [bug #54827] altcp_mbedtls_bio_recv returns MBEDTLS_ERR_SSL_WANT_READ when connecting to Azure IoT |
| Date: | Mon, 15 Oct 2018 00:29:44 -0400 (EDT) |
| User-agent: | Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36 |
Follow-up Comment #2, bug #54827 (project lwip):
I looked into debugging mbedTLS and found that the issue is caused by
MBEDTLS_SSL_MAX_CONTENT_LEN and MBEDTLS_MPI_MAX_SIZE.
mbedtls_ssk_parse_certificate
mbedtls_x509_crt_parse_der
x509_crt_parse_der_core
mbedtls_pk_parse_subpubkey
pk_get_rsapubkey
mbedtls_rsa_complete
rsa_check_context
MBEDTLS_ERR_RSA_BAD_INPUT_DATA
To connect to Azure IoT Hub, the following mbedTLS settings must be set to a
minimum of:
MBEDTLS_MPI_MAX_SIZE 512
MBEDTLS_SSL_MAX_CONTENT_LEN 3584
Note that for Amazon IoT/Greengrass and Google IoT, the following is
sufficient
MBEDTLS_MPI_MAX_SIZE 256
MBEDTLS_SSL_MAX_CONTENT_LEN 3072
Please close the bug as this is not an LWIP issue. Thank you.
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