Reworked contact system and fixed ack sending

config.example.toml

@@ -28,9 +28,12 @@ sqlite_path = "data/lorabot.db"
 # MeshCore MAX_PACKET_PAYLOAD is 184 bytes. Lower this if your text-frame
 # headers further constrain the usable payload on your device.
 max_bytes = 184
-# Seconds to wait for an ACK before treating a chunk as failed.
-ack_timeout_seconds = 30
-# How many times to retry a chunk after failure (0 = no retries).
+# Per-attempt ACK wait. 0 = trust the device's path-aware suggestion (recommended).
+# Set a positive value only if you need to override that suggestion.
+ack_timeout_seconds = 0
+# How many times to retry a chunk after failure (0 = no retries). Total attempts
+# = send_retries + 1. With send_retries >= 2 the third attempt onwards is sent as
+# a flood broadcast (multi-hop) instead of direct.
 send_retries = 1
 
 [web]
@@ -47,7 +50,7 @@ enabled          = true
 interval_seconds = 3600
 at_startup       = true
 # Flood = multi-hop advert across the mesh. False = zero-hop (neighbors only).
-flood            = false
+flood            = true
 
 # LLM tool calling. The weather tool (Open-Meteo, no key) is always on. Tools
 # in this section are optional and only registered when configured. Requires a