extmod/modussl_mbedtls: When reading and peer wants to close, return 0.

dpgeorge · dpgeorge · commit 3d4537c6d442 · 2017-03-03T15:46:23.000+11:00
If this particular code is returned then there's no more data, it's not
really an error.
diff --git a/extmod/modussl_mbedtls.c b/extmod/modussl_mbedtls.c
@@ -197,6 +197,10 @@ STATIC mp_uint_t socket_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errc
     mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
 
     int ret = mbedtls_ssl_read(&o->ssl, buf, size);
+    if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
+        // end of stream
+        return 0;
+    }
     if (ret >= 0) {
         return ret;
     }
