Initial commit: Alpine 5G Router with Fibocom FM350-GL modem configuration
- Complete working configuration for FM350-GL modem - CYTA Cyprus APN setup (internet) - AT command reference and troubleshooting guide - Configuration scripts and documentation - RNDIS mode working with manual IP configuration
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nearxos
242
configure_fm350_5g.sh
Executable file
242
configure_fm350_5g.sh
Executable file
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#!/bin/bash
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# Fibocom FM350-GL 5G Modem Configuration Script
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# For Alpine Linux with CYTA Cyprus SIM card
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#
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# This script configures the 5G modem and establishes a connection
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# Usage: ./configure_fm350_5g.sh
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set -e
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# Configuration
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AT_PORT="/dev/ttyUSB1"
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APN="internet"
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WAN_IF="eth1"
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LAN_IF="eth0.100"
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# Colors for output
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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NC='\033[0m' # No Color
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log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
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log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
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log_error() { echo -e "${RED}[ERROR]${NC} $1"; }
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send_at_cmd() {
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local cmd="$1"
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local wait="${2:-2}"
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cat $AT_PORT 2>/dev/null &
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local CAT_PID=$!
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sleep 0.3
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echo -e "${cmd}\r" > $AT_PORT
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sleep $wait
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kill $CAT_PID 2>/dev/null || true
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}
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get_at_response() {
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local cmd="$1"
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local wait="${2:-2}"
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timeout $((wait + 3)) sh -c "
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cat $AT_PORT 2>/dev/null &
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CAT_PID=\$!
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sleep 0.3
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echo -e '${cmd}\r' > $AT_PORT
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sleep $wait
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kill \$CAT_PID 2>/dev/null
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" 2>&1
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}
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check_modem() {
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log_info "Checking for FM350-GL modem..."
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if ! lsusb | grep -qi "fibocom"; then
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log_error "Fibocom modem not detected via USB"
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exit 1
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fi
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local usb_id=$(lsusb | grep -i fibocom | grep -oE '0e8d:[0-9a-f]+')
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log_info "Modem detected: $usb_id"
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if [ "$usb_id" = "0e8d:7127" ]; then
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log_warn "Modem is in Mode 41 (7127). AT commands may not work."
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log_warn "Attempting to switch to Mode 40..."
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fi
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if [ ! -c "$AT_PORT" ]; then
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log_error "AT port $AT_PORT not available"
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exit 1
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fi
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log_info "AT port available: $AT_PORT"
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}
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test_at_commands() {
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log_info "Testing AT command communication..."
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local response=$(get_at_response "AT" 1)
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if echo "$response" | grep -q "OK"; then
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log_info "AT communication working"
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return 0
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else
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log_error "AT commands not responding"
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return 1
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fi
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}
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check_signal() {
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log_info "Checking signal strength..."
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local response=$(get_at_response "AT+CSQ" 1)
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local csq=$(echo "$response" | grep "+CSQ:" | grep -oE '[0-9]+' | head -1)
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if [ -n "$csq" ]; then
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if [ "$csq" -lt 10 ]; then
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log_warn "Signal strength: $csq (weak)"
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elif [ "$csq" -lt 20 ]; then
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log_info "Signal strength: $csq (moderate)"
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else
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log_info "Signal strength: $csq (good)"
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fi
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else
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log_warn "Could not read signal strength"
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fi
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}
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configure_apn() {
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log_info "Configuring APN: $APN"
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local response=$(get_at_response "AT+CGDCONT=1,\"IP\",\"$APN\"" 2)
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if echo "$response" | grep -q "OK"; then
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log_info "APN configured successfully"
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else
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log_warn "APN configuration may have failed"
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fi
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}
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activate_pdp() {
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log_info "Activating PDP context..."
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local response=$(get_at_response "AT+CGACT=1,1" 3)
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if echo "$response" | grep -qE "(OK|CGEV)"; then
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log_info "PDP context activated"
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else
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log_warn "PDP activation response: $response"
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fi
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}
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get_modem_ip() {
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log_info "Getting modem IP address..."
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local response=$(get_at_response "AT+CGPADDR=1" 2)
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local ip=$(echo "$response" | grep "+CGPADDR:" | grep -oE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' | head -1)
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if [ -n "$ip" ]; then
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log_info "Modem IP: $ip"
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echo "$ip"
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else
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log_error "Could not get modem IP"
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return 1
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fi
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}
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configure_interface() {
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local ip="$1"
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log_info "Configuring network interface $WAN_IF..."
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ip link set $WAN_IF up 2>/dev/null || true
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ip addr flush dev $WAN_IF 2>/dev/null || true
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ip addr add $ip/32 dev $WAN_IF
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ip route add default dev $WAN_IF metric 50 2>/dev/null || true
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log_info "Interface configured with IP: $ip"
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}
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setup_nat() {
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log_info "Setting up NAT for LAN ($LAN_IF)..."
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# Enable IP forwarding
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Add NAT rules (check if they exist first)
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iptables -t nat -C POSTROUTING -o $WAN_IF -j MASQUERADE 2>/dev/null || \
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iptables -t nat -A POSTROUTING -o $WAN_IF -j MASQUERADE
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iptables -C FORWARD -i $LAN_IF -o $WAN_IF -j ACCEPT 2>/dev/null || \
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iptables -A FORWARD -i $LAN_IF -o $WAN_IF -j ACCEPT
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iptables -C FORWARD -i $WAN_IF -o $LAN_IF -m state --state RELATED,ESTABLISHED -j ACCEPT 2>/dev/null || \
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iptables -A FORWARD -i $WAN_IF -o $LAN_IF -m state --state RELATED,ESTABLISHED -j ACCEPT
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log_info "NAT configured"
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}
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test_connectivity() {
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log_info "Testing internet connectivity..."
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if ping -c 3 8.8.8.8 >/dev/null 2>&1; then
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log_info "Ping to 8.8.8.8: SUCCESS"
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else
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log_error "Ping to 8.8.8.8: FAILED"
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return 1
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fi
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if ping -c 2 google.com >/dev/null 2>&1; then
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log_info "DNS resolution: SUCCESS"
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else
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log_warn "DNS resolution failed - check /etc/resolv.conf"
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fi
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}
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show_status() {
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echo ""
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echo "========================================="
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echo " 5G Modem Configuration Summary "
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echo "========================================="
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echo ""
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echo "Modem: $(lsusb | grep -i fibocom | cut -d' ' -f6-)"
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echo "AT Port: $AT_PORT"
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echo "APN: $APN"
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echo ""
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echo "Interface: $WAN_IF"
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ip addr show $WAN_IF 2>/dev/null | grep -E "(state|inet )" | sed 's/^/ /'
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echo ""
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echo "Routing:"
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ip route show | grep -E "(default|$WAN_IF)" | sed 's/^/ /'
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echo ""
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echo "========================================="
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}
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# Main execution
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main() {
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log_info "Starting FM350-GL 5G modem configuration..."
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echo ""
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check_modem
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test_at_commands || exit 1
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check_signal
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configure_apn
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activate_pdp
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local modem_ip=$(get_modem_ip)
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if [ -z "$modem_ip" ]; then
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log_error "Failed to get modem IP. Exiting."
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exit 1
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fi
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configure_interface "$modem_ip"
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setup_nat
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test_connectivity
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show_status
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log_info "5G modem configuration complete!"
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}
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main "$@"
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