Add back wrongly removed '\n' K-V pair sent to the device

README.md

@@ -112,7 +112,7 @@ Key-value protocol was developed and is used to provide communication layer betw
 ## Design draft
 * Simple key-value protocol is introduced. It is used to communicate between DUT and host. Protocol main features:
 * Protocol introduced is master-slave protocol, where master is host and slave is device under test.
-* Transport layer consist of simple ```{{KEY;VALUE}}}``` messages sent by slave (DUT). Both key and value are strings with allowed character set limitations (to simplify parsing and protocol parser itself).
+* Transport layer consist of simple ```{{ KEY ; VALUE }} \n``` text messages sent by slave (DUT). Both key and value are strings with allowed character set limitations (to simplify parsing and protocol parser itself). Message ends with required by DUT K-V parser `\n` character.
 * DUT always (except for handshake phase) initializes communication by sending key-value message to host.
 * To avoid miscommunication between master and slave simple handshake protocol is introduces:
     * Master (host) sends sync packet: ```{{__sync;UUID-STRING}}}``` with message value containing random UUID string.

mbed_host_tests/host_tests_conn_proxy/conn_proxy.py

@@ -33,9 +33,15 @@ def __init__(self, name):
         self.logger = HtrunLogger(name)
 
     def write_kv(self, key, value):
-        kv_buff = "{{%s;%s}}"% (key, value)
+        """! Forms and sends Key-Value protocol message.
+        @details On how to parse K-V sent from DUT see KiViBufferWalker::KIVI_REGEX
+                 On how DUT sends K-V please see greentea_write_postamble() function in greentea-client
+        @return Returns buffer with K-V message sent to DUT
+        """
+        # All Key-Value messages ends with newline character
+        kv_buff = "{{%s;%s}}"% (key, value) + '\n'
         self.write(kv_buff)
-        self.logger.prn_txd(kv_buff)
+        self.logger.prn_txd(kv_buff.rstrip())
         return kv_buff
 
     def read(self, count):