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-rw-r--r--packages/meshbay-common/src/meshbay_common/protocol.py10
1 files changed, 9 insertions, 1 deletions
diff --git a/packages/meshbay-common/src/meshbay_common/protocol.py b/packages/meshbay-common/src/meshbay_common/protocol.py
index b5a54ff..1aadafe 100644
--- a/packages/meshbay-common/src/meshbay_common/protocol.py
+++ b/packages/meshbay-common/src/meshbay_common/protocol.py
@@ -27,8 +27,16 @@ class MNP:
STREAM_SEGMENT = "stream_seg" # HLS/DASH segment
CHAT_MESSAGE = "chat_msg" # Double Ratchet message
CHAT_ATTACHMENT = "chat_attach" # attachment metadata
- CHAT_HISTORY = "chat_hist" # request message history
+ CHAT_HISTORY = "chat_hist" # request message history (newest, or before a cursor)
CHAT_HISTORY_RESPONSE = "chat_hist_resp" # history response with messages
+ # Liveness on an *already open* channel. A peer that goes away without
+ # closing leaves a DataChannel that still reads as connected until the next
+ # real request hangs, and there was no way to ask. This is not a discovery
+ # mechanism: opening a connection in order to ping costs a full ICE/DTLS
+ # handshake (measured at 0.6-7 s across two ISPs), so presence in the group
+ # list comes from the hub's socket registry instead.
+ PING = "ping"
+ PONG = "pong"
# GEK_REQUEST / GEK_RESPONSE were removed (NS3, and finding L1): the node must
# never serve the GEK in plaintext. Members obtain it by unwrapping their own
# ECIES bundle. The constants lingered after the handlers were deleted, leaving