LoRaWAN: Fixing premature RX2 closure

UNITTESTS/stubs/LoRaPHY_stub.cpp

@@ -173,7 +173,8 @@ uint8_t LoRaPHY::verify_link_ADR_req(verify_adr_params_t *verify_params,
 
 void LoRaPHY::get_rx_window_params(float t_symbol, uint8_t min_rx_symbols,
                                    float rx_error, float wakeup_time,
-                                   uint32_t *window_length, int32_t *window_offset,
+                                   uint32_t *window_length, uint32_t *window_length_ms,
+                                   int32_t *window_offset,
                                    uint8_t phy_dr)
 {
 }

features/lorawan/lorastack/mac/LoRaMac.cpp

@@ -667,13 +667,14 @@ void LoRaMac::on_radio_tx_done(lorawan_time_t timestamp)
         if (get_device_class() == CLASS_C) {
             _lora_time.start(_rx2_closure_timer_for_class_c,
                              (_params.rx_window2_delay - time_diff) +
-                             _params.rx_window2_config.window_timeout);
+                             _params.rx_window2_config.window_timeout_ms);
         }
 
         // start timer after which ack wait will timeout (for Confirmed messages)
         if (_params.is_node_ack_requested) {
             _lora_time.start(_params.timers.ack_timeout_timer,
                              (_params.rx_window2_delay - time_diff) +
+                             _params.rx_window2_config.window_timeout_ms +
                              _lora_phy->get_ack_timeout());
         }
     } else {
@@ -1097,6 +1098,8 @@ lorawan_status_t LoRaMac::schedule_tx()
 {
     channel_selection_params_t next_channel;
     lorawan_time_t backoff_time = 0;
+    lorawan_time_t aggregated_timeoff = 0;
+    uint8_t channel = 0;
     uint8_t fopts_len = 0;
 
     if (_params.sys_params.max_duty_cycle == 255) {
@@ -1122,9 +1125,12 @@ lorawan_status_t LoRaMac::schedule_tx()
     next_channel.last_aggregate_tx_time = _params.timers.aggregated_last_tx_time;
 
     lorawan_status_t status = _lora_phy->set_next_channel(&next_channel,
-                                                          &_params.channel,
+                                                          &channel,
                                                           &backoff_time,
-                                                          &_params.timers.aggregated_timeoff);
+                                                          &aggregated_timeoff);
+
+    _params.channel = channel;
+    _params.timers.aggregated_timeoff = aggregated_timeoff;
 
     switch (status) {
         case LORAWAN_STATUS_NO_CHANNEL_FOUND:

features/lorawan/lorastack/phy/LoRaPHY.cpp

@@ -406,7 +406,8 @@ float LoRaPHY::compute_symb_timeout_fsk(uint8_t phy_dr)
 
 void LoRaPHY::get_rx_window_params(float t_symb, uint8_t min_rx_symb,
                                    float error_fudge, float wakeup_time,
-                                   uint32_t *window_length, int32_t *window_offset,
+                                   uint32_t *window_length, uint32_t *window_length_ms,
+                                   int32_t *window_offset,
                                    uint8_t phy_dr)
 {
     float target_rx_window_offset;
@@ -442,6 +443,7 @@ void LoRaPHY::get_rx_window_params(float t_symb, uint8_t min_rx_symb,
     // Setting the window_length in terms of 'symbols' for LoRa modulation or
     // in terms of 'bytes' for FSK
     *window_length = (uint32_t) ceil(window_len_in_ms / t_symb);
+    *window_length_ms = window_len_in_ms;
 }
 
 int8_t LoRaPHY::compute_tx_power(int8_t tx_power_idx, float max_eirp,
@@ -628,8 +630,7 @@ uint16_t LoRaPHY::get_maximum_frame_counter_gap()
 uint32_t LoRaPHY::get_ack_timeout()
 {
     uint16_t ack_timeout_rnd = phy_params.ack_timeout_rnd;
-    return (phy_params.ack_timeout
-            + get_random(-ack_timeout_rnd, ack_timeout_rnd));
+    return (phy_params.ack_timeout + get_random(0, ack_timeout_rnd));
 }
 
 uint32_t LoRaPHY::get_default_rx2_frequency()
@@ -849,7 +850,8 @@ void LoRaPHY::compute_rx_win_params(int8_t datarate, uint8_t min_rx_symbols,
     }
 
     get_rx_window_params(t_symbol, min_rx_symbols, (float) rx_error, MBED_CONF_LORA_WAKEUP_TIME,
-                         &rx_conf_params->window_timeout, &rx_conf_params->window_offset,
+                         &rx_conf_params->window_timeout, &rx_conf_params->window_timeout_ms,
+                         &rx_conf_params->window_offset,
                          rx_conf_params->datarate);
 }
 

features/lorawan/lorastack/phy/LoRaPHY.h

@@ -626,7 +626,8 @@ class LoRaPHY : private mbed::NonCopyable<LoRaPHY> {
      */
     void get_rx_window_params(float t_symbol, uint8_t min_rx_symbols,
                               float rx_error, float wakeup_time,
-                              uint32_t *window_length, int32_t *window_offset,
+                              uint32_t *window_length, uint32_t *window_length_ms,
+                              int32_t *window_offset,
                               uint8_t phy_dr);
 
     /**

features/lorawan/system/lorawan_data_structures.h

@@ -1007,9 +1007,13 @@ typedef struct {
      */
     uint32_t frequency;
     /*!
-     * The RX window timeout
+     * The RX window timeout - Symbols
      */
     uint32_t window_timeout;
+    /*!
+     * The RX window timeout - Milliseconds
+     */
+    uint32_t window_timeout_ms;
     /*!
      * The RX window offset
      */