From 321d75e08769b82d951fdf65379dab8d0ce76e2f Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Wed, 28 Nov 2018 11:55:27 +1100
Subject: [PATCH] esp8266/modnetwork: Automatically do radio sleep if no
 interface active.

Reduces current of device by about 55mA when radio is sleeping.
---
 ports/esp8266/main.c       | 7 +++++++
 ports/esp8266/modnetwork.c | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/ports/esp8266/main.c b/ports/esp8266/main.c
index 7bb2d8d577..482e32e4d8 100644
--- a/ports/esp8266/main.c
+++ b/ports/esp8266/main.c
@@ -102,6 +102,13 @@ void soft_reset(void) {
 }
 
 void init_done(void) {
+    // Configure sleep, and put the radio to sleep if no interfaces are active
+    wifi_fpm_set_sleep_type(MODEM_SLEEP_T);
+    if (wifi_get_opmode() == NULL_MODE) {
+        wifi_fpm_open();
+        wifi_fpm_do_sleep(0xfffffff);
+    }
+
     #if MICROPY_REPL_EVENT_DRIVEN
     uart_task_init();
     #endif
diff --git a/ports/esp8266/modnetwork.c b/ports/esp8266/modnetwork.c
index c7f3397c44..16401c939d 100644
--- a/ports/esp8266/modnetwork.c
+++ b/ports/esp8266/modnetwork.c
@@ -83,7 +83,15 @@ STATIC mp_obj_t esp_active(size_t n_args, const mp_obj_t *args) {
         } else {
             mode &= ~mask;
         }
+        if (mode != NULL_MODE) {
+            wifi_fpm_do_wakeup();
+            wifi_fpm_close();
+        }
         error_check(wifi_set_opmode(mode), "Cannot update i/f status");
+        if (mode == NULL_MODE) {
+            wifi_fpm_open();
+            wifi_fpm_do_sleep(0xfffffff);
+        }
         return mp_const_none;
     }