Previously device tests included information such as access point SSID/password at compile time. This made it difficult to compile test binaries once and then send them to multiple test runners for execution.
This change adds a command to the test library to set environment variable on the target device: “setenv key value”. C library setenv/getenv facility is used to store variables.
Test runner, tests, and makefile are updated to use this functionality.
Reported in https://github.com/esp8266/Arduino/issues/4078.
WiFiClient::stopAll, called from a WiFi disconnected event handler,
could be called while WiFiClient::connect was in progress. This issue
was initially fixed in #4194, by testing `this` pointer for being
non-null in ClientContext::connect.
This change delegates deletion of ClientContext to WiFiClient
destructor. WiFiClient::stop only calls ClientContext::stop, which
closes/aborts the connection.
