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diff --git a/lora_pkt_fwd/src/lora_pkt_fwd.c b/lora_pkt_fwd/src/lora_pkt_fwd.c
index 801f28d..7b63b8f 100644
--- a/lora_pkt_fwd/src/lora_pkt_fwd.c
+++ b/lora_pkt_fwd/src/lora_pkt_fwd.c
@@ -134,7 +134,13 @@ static char serv_port_up[8] = STR(DEFAULT_PORT_UP); /* server port for upstream traffic */
static char serv_port_down[8] = STR(DEFAULT_PORT_DW); /* server port for downstream traffic */
static int keepalive_time = DEFAULT_KEEPALIVE; /* send a PULL_DATA request every X seconds, negative = disabled */
+static bool duty_cycle_enabled = true;
+static uint32_t duty_cycle_time_avail = 0;
+static uint32_t duty_cycle_period = 3600; // seconds in one hour
+static double duty_cycle_ratio = 0.10; // 10%
+static uint32_t duty_cycle_time_max = 3600 * 0.10 * 1000u; // max time-on-air in window
+
/* statistics collection configuration variables */
static unsigned stat_interval = DEFAULT_STAT; /* time interval (in sec) at which statistics are collected and displayed */
@@ -729,8 +746,32 @@ static int parse_gateway_configuration(const char * conf_file) {
push_timeout_half.tv_usec = 500 * (long int)json_value_get_number(val);
MSG("INFO: upstream PUSH_DATA time-out is configured to %u ms\n", (unsigned)(push_timeout_half.tv_usec / 500));
}
+
+ /* duty-cycle limiting */
+ val = json_object_get_value(conf_obj, "duty_cycle_enabled");
+ if (json_value_get_type(val) == JSONBoolean) {
+ duty_cycle_enabled = (bool)json_value_get_boolean(val);
+ }
+ MSG("INFO: duty cycle will%s be enforced\n", (duty_cycle_enabled ? "" : " NOT"));
+
+ if (duty_cycle_enabled) {
+ val = json_object_get_value(conf_obj, "duty_cycle_period");
+ if (val != NULL) {
+ duty_cycle_period = (unsigned)json_value_get_number(val);
+ }
+ MSG("INFO: duty cycle period %u s\n", (duty_cycle_period));
+
+ val = json_object_get_value(conf_obj, "duty_cycle_ratio");
+ if (val != NULL) {
+ duty_cycle_ratio = (double)json_value_get_number(val);
+ }
+ MSG("INFO: duty cycle %f %%\n", (duty_cycle_ratio * 100));
+
+ duty_cycle_time_max = duty_cycle_period * 1000u * duty_cycle_ratio;
+ }
+
/* packet filtering parameters */
val = json_object_get_value(conf_obj, "forward_crc_valid");
if (json_value_get_type(val) == JSONBoolean) {
fwd_valid_pkt = (bool)json_value_get_boolean(val);
@@ -2833,6 +2921,25 @@ void thread_valid(void) {
while (!exit_sig && !quit_sig) {
wait_ms(1000);
+ if (duty_cycle_enabled) {
+ static struct timespec last = { 0, 0 };
+ struct timespec now;
+ clock_gettime(CLOCK_MONOTONIC, &now);
+
+ if (last.tv_sec != 0) {
+ // uint64(now.tv_sec) * 1000 + now.tv_nsec / 1000000
+
+ duty_cycle_time_avail += difftimespec(now, last) * 1000u * duty_cycle_ratio;
+
+ if (duty_cycle_time_avail > duty_cycle_time_max) {
+ duty_cycle_time_avail = duty_cycle_time_max;
+ }
+ }
+
+ last = now;
+ }
+
+
/* calculate when the time reference was last updated */
pthread_mutex_lock(&mx_timeref);
gps_ref_age = (long)difftime(time(NULL), time_reference_gps.systime);
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