feat(config): add dynamic coding rate settings

Author: Komzpa

meshtastic/config.proto

@@ -1064,6 +1064,18 @@ message Config {
       NOT_PRESENT = 2;
     }
 
+    enum DynamicCodingRateMode {
+      /*
+       * Keep using the configured static coding rate.
+       */
+      DCR_OFF = 0;
+
+      /*
+       * Select LoRa coding rate per packet using local airtime policy.
+       */
+      DCR_ON = 1;
+    }
+
     /*
      * When enabled, the `modem_preset` fields will be adhered to, else the `bandwidth`/`spread_factor`/`coding_rate`
      * will be taked from their respective manually defined fields
@@ -1188,6 +1200,48 @@ message Config {
      * Set where LORA FEM is enabled, disabled, or not present
      */
     FEM_LNA_Mode fem_lna_mode = 106;
+
+    /*
+     * Dynamic Coding Rate policy mode. DCR_OFF keeps the configured static coding rate; DCR_ON applies
+     * per-packet CR selection.
+     */
+    DynamicCodingRateMode dcr_mode = 107;
+
+    /*
+     * Minimum CR denominator DCR may choose. 0 means firmware default, currently 5 (CR 4/5).
+     */
+    uint32 dcr_min_cr = 108;
+
+    /*
+     * Maximum CR denominator DCR may choose. 0 means firmware default, currently 8 (CR 4/8).
+     */
+    uint32 dcr_max_cr = 109;
+
+    /*
+     * Max percentage of local TX airtime in the rolling DCR window that may be CR 4/8 for non-urgent packets.
+     * 0 means firmware default, currently 10 percent.
+     */
+    uint32 dcr_robust_airtime_pct = 110;
+
+    /*
+     * Disable local per-neighbor coding-rate tracking. Tracking is enabled by default and is local-only.
+     */
+    bool dcr_disable_neighbor_tracking = 111;
+
+    /*
+     * Maximum CR denominator for routine telemetry/position/nodeinfo traffic. 0 means firmware default, currently 6.
+     */
+    uint32 dcr_telemetry_max_cr = 112;
+
+    /*
+     * Minimum CR denominator for normal user-value packets such as text. 0 means firmware default, currently 5.
+     */
+    uint32 dcr_user_min_cr = 113;
+
+    /*
+     * Minimum CR denominator for alert/urgent packets. 0 means firmware default, currently 7.
+     */
+    uint32 dcr_alert_min_cr = 114;
   }
 
   message BluetoothConfig {