Timer task is failed to call and publish messages on vxworks6.8/paho.mqtt.embedded-c

[fightinghui]

When I created timer task to publish messages, this publish function is failed to return -1. When I tried to use timer task send semaphores，another task receive semaphores to publish messages，this is still failed to return -1. But I use udp task to call publish messages，this is successful.

I'm looking forward your reply.thanks.