- fix setup errors

setup/setup_agent_gsm.sh

@@ -7,7 +7,8 @@ INSTALL_DIR=agent_gsm
 GIT_SOURCE=https://git.sevana.biz/public/agent_gsm_redist
 
 # Install prerequisites
-sudo apt install git mc python3 sox vim
+sudo apt install git mc python3 sox vim libffi-dev
+sudo pip3 install pyyaml sox pyrabbit soundfile dbus_python pexpect pydub requests
 
 if [ -f "$INSTALL_DIR" ]; then
     rm -rf "$INSTALL_DIR"
@@ -32,7 +33,7 @@ cp config/agent.in.yaml config/agent.yaml
 
 # Replace the values
 if [[ $BACKEND_URL != "" ]]; then
-  sed -i "s|BACKEND_URL|$BACKEND_URL|" config/agent.yaml
+  sed -i "s|BACKEND|$BACKEND|" config/agent.yaml
 fi
 
 if [[ $PHONE_NAME != "" ]]; then