Add handling of GTP-U Echo Request #528
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As specified in TS 129.281, ```text Even if there is no path in use, a GTP-U peer shall be prepared to receive an Echo Request at any time and it shall reply with an Echo Response. ``` Also: ```text 4.4.3.2 Echo Response Message The IP Source Address shall be copied from the IP destination address of the GTP request message to which this GTP-U entity is replying. The IP Destination Address shall be copied from the IP Source Address of the GTP request message to which this GTP-U entity is replying. ``` With the current implementation, the gnb do not respond to GTP-U Echo Request and log the following message: ```text [gtp] [error] TEID 0 not found on GTP-U Downlink ``` With this PR, a GTP-U Echo Response is send back to the GTP peer.
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As specified in TS 129.281,
Also:
With the current implementation, the gnb do not respond to GTP-U Echo Request and log the following message:
With this PR, a GTP-U Echo Response is send back to the GTP peer.