aws-iot-sdk: add variable to establish the logging level

Variable 'AWS_IOT_LOGGING_LEVEL' can be used from the project 'local.conf' to
establish the logging level of the AWS IoT Device SDK.

There are 6 incremental levels: none, error, warn, info, debug, and trace.

Default is 'debug'.

https://jira.digi.com/browse/DEL-4101

Signed-off-by: Tatiana Leon <tatiana.leon@digi.com>

meta-digi-dey/classes/awsiotsdk-c.bbclass

@@ -63,3 +63,25 @@ AWS_IOT_MQTT_MIN_RECONNECT_WAIT_INTERVAL ?= "1000"
 # to reconnect (milliseconds)
 AWS_IOT_MQTT_MAX_RECONNECT_WAIT_INTERVAL ?= "128000"
 
+# Logging level control: error, warn, info, debug, trace.
+AWS_IOT_LOGGING_LEVEL ?= "debug"
+
+def get_log_level(d):
+    levels = ['error', 'warn', 'info', 'debug', 'trace']
+    log_flags = ""
+
+    log_level = d.getVar('AWS_IOT_LOGGING_LEVEL', True)
+    if log_level == 'none':
+        return ""
+    if log_level not in levels:
+        log_level = "debug"
+        d.setVar('AWS_IOT_LOGGING_LEVEL', log_level)
+
+    log_index = levels.index(log_level)
+    for i, val in enumerate(levels):
+        log_flags = log_flags + "-DENABLE_IOT_" + val.upper() + " "
+        if i == log_index:
+            break;
+
+    return log_flags
+

meta-digi-dey/recipes-digi/awsiotsdk-c/awsiotsdk-c_2.1.1.bb

@@ -24,6 +24,8 @@ S = "${WORKDIR}/aws-iot-device-sdk-embedded-C-${PV}"
 
 inherit awsiotsdk-c pkgconfig
 
+EXTRA_OEMAKE += "'LOG_FLAGS=${@get_log_level(d)}'"
+
 do_configure() {
 	cp -f ${WORKDIR}/awsiotsdk.pc ${S}