revert PR #95 due to bug; revert #114 due to timing issues; fix MQTT crashes

mqtt/mqtt.c

@@ -497,9 +497,11 @@ mqtt_dns_found(const char* name, ip_addr_t* ipaddr, void* arg) {
 
   if (ipaddr == NULL) {
     os_printf("MQTT: DNS lookup failed\n");
+    if (client != NULL) {
       client->timeoutTick = client->reconTimeout;
       if (client->reconTimeout < 128) client->reconTimeout <<= 1;
       client->connState = TCP_RECONNECT_REQ; // the timer will kick-off a reconnection
+    }
     return;
   }
   DBG_MQTT("MQTT: ip %d.%d.%d.%d\n",
@@ -508,7 +510,7 @@ mqtt_dns_found(const char* name, ip_addr_t* ipaddr, void* arg) {
             *((uint8 *)&ipaddr->addr + 2),
             *((uint8 *)&ipaddr->addr + 3));
 
-  if (client->ip.addr == 0 && ipaddr->addr != 0) {
+  if (client != NULL && client->ip.addr == 0 && ipaddr->addr != 0) {
     os_memcpy(client->pCon->proto.tcp->remote_ip, &ipaddr->addr, 4);
     uint8_t err;
     if (client->security)

serial/serbridge.c

@@ -177,11 +177,8 @@ serbridgeRecvCb(void *arg, char *data, unsigned short len)
         (len == 2 && strncmp(data, "?\n", 2) == 0) ||
         (len == 3 && strncmp(data, "?\r\n", 3) == 0)) {
       startPGM = true;
+      conn->conn_mode = cmPGM;
 
-      // Don't actually reboot the target until we've actually received
-      // serial data to send to the target.
-      conn->conn_mode = cmPGMInit;
-      return;
     // If the connection starts with a telnet negotiation we will do telnet
     }
     else if (len >= 3 && strncmp(data, (char[]){IAC, WILL, ComPortOpt}, 3) == 0) {